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Note 6 - Stockholders' Equity - Common Stock Dividend Policy (Details) | 3 Months Ended
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Mar. 31, 2021 $ / shares
Quarterly Average Realized Price, Level 1 [Member] |
Quarterly dividend per share (in dollars per share) | $ 0.0075
Annual dividend per share (in dollars per share) | 0.03
Minimum annual component per share (in dollars per share) | 0.015
Annualized dividends (in dollars per share) | 0.045
Quarterly Average Realized Price, Level 2 [Member] |
Quarterly dividend per share (in dollars per share) | 0.0125
Annual dividend per share (in dollars per share) | 0.05
Minimum annual component per share (in dollars per share) | 0.015
Annualized dividends (in dollars per share) | 0.065
Quarterly Average Realized Price, Level 3 [Member] |
Quarterly dividend per share (in dollars per share) | 0.0225
Annual dividend per share (in dollars per share) | 0.09
Minimum annual component per share (in dollars per share) | 0.015
Annualized dividends (in dollars per share) | 0.105
Quarterly Average Realized Price, Level 4 [Member] |
Quarterly dividend per share (in dollars per share) | 0.0325
Annual dividend per share (in dollars per share) | 0.13
Minimum annual component per share (in dollars per share) | 0.015
Annualized dividends (in dollars per share) | 0.145
Quarterly Average Realized Price, Level 5 [Member] |
Quarterly dividend per share (in dollars per share) | 0.0425
Annual dividend per share (in dollars per share) | 0.17
Minimum annual component per share (in dollars per share) | 0.015
Annualized dividends (in dollars per share) | 0.185
Quarterly Average Realized Price, Level 6 [Member] |
Quarterly dividend per share (in dollars per share) | 0.0525
Annual dividend per share (in dollars per share) | 0.21
Minimum annual component per share (in dollars per share) | 0.015
Annualized dividends (in dollars per share) | $ 0.225

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- Definition The amount of annualized dividends per share. + References No definition available. + Details
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