| CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($)$ in Thousands
 | Total | Preferred Stock | Common Stock | Additional Paid-In Capital | Retained Earnings | Accumulated Other Comprehensive (Loss) Income | Treasury Stock | 
| Preferred stock, beginning balance (in shares) at Dec. 31, 2017 |  | 0 |  |  |  |  |  | 
| Common stock, beginning balance (in shares) at Dec. 31, 2017 |  |  | 12,979,414 |  |  |  |  | 
| Treasury stock, beginning balance (in shares) at Dec. 31, 2017 |  |  |  |  |  |  | (1,637,524) | 
| Stockholders' equity, beginning balance at Dec. 31, 2017 | $ 90,621 | $ 0 | $ 13 | $ 86,683 | $ 44,908 | $ (413) | $ (40,570) | 
| Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  | 
| Net income (loss) | 8,824 |  |  |  | 8,824 |  |  | 
| Common stock issued | 554 |  |  | (268) |  |  | $ 822 | 
| Common stock issued (in shares) |  |  |  |  |  |  | 34,202 | 
| Dividends declared | (1,479) |  |  |  | (1,479) |  |  | 
| Foreign currency translation adjustment | 397 |  |  |  |  | 397 |  | 
| Unrealized gains on available-for-sale securities | (11) |  |  |  |  | (11) |  | 
| Preferred stock, ending balance (in shares) at Mar. 31, 2018 |  | 0 |  |  |  |  |  | 
| Common stock, ending balance (in shares) at Mar. 31, 2018 |  |  | 12,979,414 |  |  |  |  | 
| Treasury stock, ending balance (in shares) at Mar. 31, 2018 |  |  |  |  |  |  | (1,603,322) | 
| Stockholders' equity, ending balance at Mar. 31, 2018 | 98,906 | $ 0 | $ 13 | 86,415 | 52,253 | (27) | $ (39,748) | 
| Preferred stock, beginning balance (in shares) at Dec. 31, 2017 |  | 0 |  |  |  |  |  | 
| Common stock, beginning balance (in shares) at Dec. 31, 2017 |  |  | 12,979,414 |  |  |  |  | 
| Treasury stock, beginning balance (in shares) at Dec. 31, 2017 |  |  |  |  |  |  | (1,637,524) | 
| Stockholders' equity, beginning balance at Dec. 31, 2017 | 90,621 | $ 0 | $ 13 | 86,683 | 44,908 | (413) | $ (40,570) | 
| Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  | 
| Net income (loss) | 25,476 |  |  |  |  |  |  | 
| Foreign currency translation adjustment | (798) |  |  |  |  |  |  | 
| Unrealized gains on available-for-sale securities | 9 |  |  |  |  |  |  | 
| Preferred stock, ending balance (in shares) at Sep. 30, 2018 |  | 0 |  |  |  |  |  | 
| Common stock, ending balance (in shares) at Sep. 30, 2018 |  |  | 12,979,414 |  |  |  |  | 
| Treasury stock, ending balance (in shares) at Sep. 30, 2018 |  |  |  |  |  |  | (1,603,322) | 
| Stockholders' equity, ending balance at Sep. 30, 2018 | 88,218 | $ 0 | $ 13 | 86,415 | 42,740 | (1,202) | $ (39,748) | 
| Preferred stock, beginning balance (in shares) at Mar. 31, 2018 |  | 0 |  |  |  |  |  | 
| Common stock, beginning balance (in shares) at Mar. 31, 2018 |  |  | 12,979,414 |  |  |  |  | 
| Treasury stock, beginning balance (in shares) at Mar. 31, 2018 |  |  |  |  |  |  | (1,603,322) | 
| Stockholders' equity, beginning balance at Mar. 31, 2018 | 98,906 | $ 0 | $ 13 | 86,415 | 52,253 | (27) | $ (39,748) | 
| Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  | 
| Net income (loss) | 9,023 |  |  |  | 9,023 |  |  | 
| Dividends declared | (21,614) |  |  |  | (21,614) |  |  | 
| Foreign currency translation adjustment | (762) |  |  |  |  | (762) |  | 
| Unrealized gains on available-for-sale securities | 15 |  |  |  |  | 15 |  | 
| Preferred stock, ending balance (in shares) at Jun. 30, 2018 |  | 0 |  |  |  |  |  | 
| Common stock, ending balance (in shares) at Jun. 30, 2018 |  |  | 12,979,414 |  |  |  |  | 
| Treasury stock, ending balance (in shares) at Jun. 30, 2018 |  |  |  |  |  |  | (1,603,322) | 
| Stockholders' equity, ending balance at Jun. 30, 2018 | 85,568 | $ 0 | $ 13 | 86,415 | 39,662 | (774) | $ (39,748) | 
| Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  | 
| Net income (loss) | 7,629 |  |  |  | 7,629 |  |  | 
| Dividends declared | (4,551) |  |  |  | (4,551) |  |  | 
| Foreign currency translation adjustment | (433) |  |  |  |  | (433) |  | 
| Unrealized gains on available-for-sale securities | 5 |  |  |  |  | 5 |  | 
| Preferred stock, ending balance (in shares) at Sep. 30, 2018 |  | 0 |  |  |  |  |  | 
| Common stock, ending balance (in shares) at Sep. 30, 2018 |  |  | 12,979,414 |  |  |  |  | 
| Treasury stock, ending balance (in shares) at Sep. 30, 2018 |  |  |  |  |  |  | (1,603,322) | 
| Stockholders' equity, ending balance at Sep. 30, 2018 | $ 88,218 | $ 0 | $ 13 | 86,415 | 42,740 | (1,202) | $ (39,748) | 
| Preferred stock, beginning balance (in shares) at Dec. 31, 2018 | 0 | 0 |  |  |  |  |  | 
| Common stock, beginning balance (in shares) at Dec. 31, 2018 | 12,979,414 |  | 12,979,414 |  |  |  |  | 
| Treasury stock, beginning balance (in shares) at Dec. 31, 2018 | (1,603,322) |  |  |  |  |  | (1,603,322) | 
| Stockholders' equity, beginning balance at Dec. 31, 2018 | $ 89,861 | $ 0 | $ 13 | 86,415 | 44,431 | (1,250) | $ (39,748) | 
| Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  | 
| Net income (loss) | (1,923) |  |  |  | (1,923) |  |  | 
| Common stock issued | 377 |  |  | (166) |  |  | $ 543 | 
| Common stock issued (in shares) |  |  |  |  |  |  | 22,603 | 
| Dividends declared | (2,736) |  |  |  | (2,736) |  |  | 
| Foreign currency translation adjustment | 259 |  |  |  |  | 259 |  | 
| Unrealized gains on available-for-sale securities | 17 |  |  |  |  | 17 |  | 
| Preferred stock, ending balance (in shares) at Mar. 31, 2019 |  | 0 |  |  |  |  |  | 
| Common stock, ending balance (in shares) at Mar. 31, 2019 |  |  | 12,979,414 |  |  |  |  | 
| Treasury stock, ending balance (in shares) at Mar. 31, 2019 |  |  |  |  |  |  | (1,580,719) | 
| Stockholders' equity, ending balance at Mar. 31, 2019 | $ 85,855 | $ 0 | $ 13 | 86,249 | 39,772 | (974) | $ (39,205) | 
| Preferred stock, beginning balance (in shares) at Dec. 31, 2018 | 0 | 0 |  |  |  |  |  | 
| Common stock, beginning balance (in shares) at Dec. 31, 2018 | 12,979,414 |  | 12,979,414 |  |  |  |  | 
| Treasury stock, beginning balance (in shares) at Dec. 31, 2018 | (1,603,322) |  |  |  |  |  | (1,603,322) | 
| Stockholders' equity, beginning balance at Dec. 31, 2018 | $ 89,861 | $ 0 | $ 13 | 86,415 | 44,431 | (1,250) | $ (39,748) | 
| Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  | 
| Net income (loss) | (2,769) |  |  |  |  |  |  | 
| Foreign currency translation adjustment | (537) |  |  |  |  |  |  | 
| Unrealized gains on available-for-sale securities | $ 23 |  |  |  |  |  |  | 
| Preferred stock, ending balance (in shares) at Sep. 30, 2019 | 0 | 0 |  |  |  |  |  | 
| Common stock, ending balance (in shares) at Sep. 30, 2019 | 12,979,414 |  | 12,979,414 |  |  |  |  | 
| Treasury stock, ending balance (in shares) at Sep. 30, 2019 | (1,459,090) |  |  |  |  |  | (1,459,090) | 
| Stockholders' equity, ending balance at Sep. 30, 2019 | $ 82,567 | $ 0 | $ 13 | 86,102 | 23,567 | (1,764) | $ (25,351) | 
| Preferred stock, beginning balance (in shares) at Mar. 31, 2019 |  | 0 |  |  |  |  |  | 
| Common stock, beginning balance (in shares) at Mar. 31, 2019 |  |  | 12,979,414 |  |  |  |  | 
| Treasury stock, beginning balance (in shares) at Mar. 31, 2019 |  |  |  |  |  |  | (1,580,719) | 
| Stockholders' equity, beginning balance at Mar. 31, 2019 | 85,855 | $ 0 | $ 13 | 86,249 | 39,772 | (974) | $ (39,205) | 
| Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  | 
| Net income (loss) | 397 |  |  |  | 397 |  |  | 
| Repurchase of common stock (in shares) |  |  |  |  |  |  | (612,729) | 
| Repurchase of common stock | (6,682) |  |  |  |  |  | $ (6,682) | 
| Foreign currency translation adjustment | (212) |  |  |  |  | (212) |  | 
| Unrealized gains on available-for-sale securities | (6) |  |  |  |  | (6) |  | 
| Preferred stock, ending balance (in shares) at Jun. 30, 2019 |  | 0 |  |  |  |  |  | 
| Common stock, ending balance (in shares) at Jun. 30, 2019 |  |  | 12,979,414 |  |  |  |  | 
| Treasury stock, ending balance (in shares) at Jun. 30, 2019 |  |  |  |  |  |  | (2,193,448) | 
| Stockholders' equity, ending balance at Jun. 30, 2019 | 79,352 | $ 0 | $ 13 | 86,249 | 40,169 | (1,192) | $ (45,887) | 
| Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  | 
| Net income (loss) | (1,243) |  |  |  | (1,243) |  |  | 
| Common stock issued | 7,912 |  |  | (147) | (15,359) |  | $ 23,418 | 
| Common stock issued (in shares) |  |  |  |  |  |  | 1,117,485 | 
| Repurchase of common stock (in shares) |  |  |  |  |  |  | (383,127) | 
| Repurchase of common stock | (2,882) |  |  |  |  |  | $ (2,882) | 
| Foreign currency translation adjustment | (584) |  |  |  |  | (584) |  | 
| Unrealized gains on available-for-sale securities | $ 12 |  |  |  |  | 12 |  | 
| Preferred stock, ending balance (in shares) at Sep. 30, 2019 | 0 | 0 |  |  |  |  |  | 
| Common stock, ending balance (in shares) at Sep. 30, 2019 | 12,979,414 |  | 12,979,414 |  |  |  |  | 
| Treasury stock, ending balance (in shares) at Sep. 30, 2019 | (1,459,090) |  |  |  |  |  | (1,459,090) | 
| Stockholders' equity, ending balance at Sep. 30, 2019 | $ 82,567 | $ 0 | $ 13 | $ 86,102 | $ 23,567 | $ (1,764) | $ (25,351) |