Quarterly report pursuant to Section 13 or 15(d)

Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals)

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Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares
Mar. 31, 2021
Dec. 31, 2020
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, authorized (in shares) 5,000,000 5,000,000
Preferred stock, issued (in shares) 0 0
Preferred stock, outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, authorized (in shares) 50,000,000 50,000,000
Common stock, issued (in shares) 12,979,414 12,979,414
Treasury stock, shares (in shares) 1,556,875 1,556,875