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Note 10 - Stockholders' Equity - Share Incentive Plan Activity (Details) - Restricted Stock Units (RSUs) [Member] - USD ($)
12 Months Ended 42 Months Ended
Dec. 31, 2020
Dec. 31, 2013
Dec. 31, 2020
Dec. 31, 2019
Outstanding, units (in shares) 133,747      
Outstanding, weighted average grant-date fair value (in dollars per share) $ 5.47      
Outstanding, aggregated intrinsic value $ 250,183   $ 250,183 $ 50,824
Granted, units (in shares) 44,430 25,000 92,081  
Granted, weighted average grant-date fair value (in dollars per share) $ 6.47      
Vested and settled with share issuance, units (in shares) (33,211)      
Vested and settled with share issuance, weighted average grant-date fair value (in dollars per share) $ 4.15      
Forfeited, units (in shares) (16,667)      
Forfeited, weighted average grant-date fair value (in dollars per share) $ 8.32      
Outstanding, units (in shares) 128,299   128,299  
Outstanding, weighted average grant-date fair value (in dollars per share) $ 5.79   $ 5.79