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Note 6 - Stockholders' Equity - Common Stock Dividend Policy (Details) | 6 Months Ended
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Jun. 30, 2021 $ / shares
Quarterly Average Realized Price, Level 1 [Member] |
Quarterly dividend per share (in dollars per share) | $ 0.75
Annual dividend per share (in dollars per share) | 3
Minimum annual component per share (in dollars per share) | 1.5
Annualized dividends (in dollars per share) | 4.5
Quarterly Average Realized Price, Level 2 [Member] |
Quarterly dividend per share (in dollars per share) | 1.25
Annual dividend per share (in dollars per share) | 5
Minimum annual component per share (in dollars per share) | 1.5
Annualized dividends (in dollars per share) | 6.5
Quarterly Average Realized Price, Level 3 [Member] |
Quarterly dividend per share (in dollars per share) | 2.25
Annual dividend per share (in dollars per share) | 9
Minimum annual component per share (in dollars per share) | 1.5
Annualized dividends (in dollars per share) | 10.5
Quarterly Average Realized Price, Level 4 [Member] |
Quarterly dividend per share (in dollars per share) | 3.25
Annual dividend per share (in dollars per share) | 13
Minimum annual component per share (in dollars per share) | 1.5
Annualized dividends (in dollars per share) | 14.5
Quarterly Average Realized Price, Level 5 [Member] |
Quarterly dividend per share (in dollars per share) | 4.25
Annual dividend per share (in dollars per share) | 17
Minimum annual component per share (in dollars per share) | 1.5
Annualized dividends (in dollars per share) | 18.5
Quarterly Average Realized Price, Level 6 [Member] |
Quarterly dividend per share (in dollars per share) | 5.25
Annual dividend per share (in dollars per share) | 21
Minimum annual component per share (in dollars per share) | 1.5
Annualized dividends (in dollars per share) | $ 22.5

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