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Note 10 - Stockholders' Equity - Common Stock Dividend Policy (Details) | 12 Months Ended
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Dec. 31, 2020 $ / shares
Quarterly Average Realized Price, Level 1 [Member] |
Quarterly dividend per share (in dollars per share) | $ 0.005
Annual dividend per share (in dollars per share) | 0.02
Quarterly Average Realized Price, Level 2 [Member] |
Quarterly dividend per share (in dollars per share) | 0.01
Annual dividend per share (in dollars per share) | 0.04
Quarterly Average Realized Price, Level 3 [Member] |
Quarterly dividend per share (in dollars per share) | 0.02
Annual dividend per share (in dollars per share) | 0.08
Quarterly Average Realized Price, Level 4 [Member] |
Quarterly dividend per share (in dollars per share) | 0.03
Annual dividend per share (in dollars per share) | 0.12
Quarterly Average Realized Price, Level 5 [Member] |
Quarterly dividend per share (in dollars per share) | 0.04
Annual dividend per share (in dollars per share) | 0.16
Quarterly Average Realized Price, Level 6 [Member] |
Quarterly dividend per share (in dollars per share) | 0.05
Annual dividend per share (in dollars per share) | 0.20
Quarterly Average Realized Price, Level 7 [Member] |
Quarterly dividend per share (in dollars per share) | 0.06
Annual dividend per share (in dollars per share) | 0.24
Quarterly Average Realized Price, Level 8 [Member] |
Quarterly dividend per share (in dollars per share) | 0.07
Annual dividend per share (in dollars per share) | $ 0.28

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