Consolidated Statements of Stockholders' Equity (Unaudited) (Parentheticals) - $ / shares  | 
3 Months Ended | |||
|---|---|---|---|---|
Sep. 30, 2020  | 
Jun. 30, 2020  | 
Mar. 31, 2020  | 
Mar. 31, 2019  | 
|
| Dividends declared, per share (in dollars per share) | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.24 | 
| X | ||||||||||
- Definition Aggregate dividends declared during the period for each share of common stock outstanding. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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