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Note 18 - Stockholders' Equity - Option and Warrant Activity (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Outstanding, options (in shares) | 471,144 | 471,144
Outstanding, weighted average exercise price (in dollars per share) | $ 3.95 | $ 3.95
Outstanding, warrants (in shares) |  |
Outstanding, warrants, weighted average exercise price (in dollars per share) |  |
Granted, options (in shares) |  |
Granted, weighted average exercise price (in dollars per share) |  |
Granted, warrants (in shares) | 792,660 |
Granted, warrants, weighted average exercise price (in dollars per share) | $ 1 |
Cancelled/Expired, options (in shares) | (471,144) |
Cancelled/Expired, weighted average exercise price (in dollars per share) | $ 3.95 |
Cancelled/Expired, warrants (in shares) |  |
Cancelled/Expired, warrants, weighted average exercise price (in dollars per share) |  |
Exercised/Issued, options (in shares) |  |
Exercised/Issued, weighted average exercise price (in dollars per share) |  |
Exercised/Issued, warrants (in shares) | (597,500) |
Exercised/Issued, warrants, weighted average exercise price (in dollars per share) | $ 1 |
Outstanding, options (in shares) |  | 471,144
Outstanding, weighted average exercise price (in dollars per share) |  | $ 3.95
Outstanding, warrants (in shares) | 195,160 |
Outstanding, warrants, weighted average exercise price (in dollars per share) | $ 1 |
Exercisable at the end of period, options (in shares) | 312,020 |
Exercisable at the end of period, weighted average exercise price (in dollars per share) |  |
Exercisable at December 31, 2020, warrants (in shares) | 195,160 |
Exercisable at December 31, 2020, warrants, weighted average exercise price (in dollars per share) | $ 1 |

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