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Note 8 - Stockholders' Equity - Share Incentive Plan Activity (Details) - Restricted Stock Units (RSUs) [Member] - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Outstanding, units (in shares) 128,299  
Outstanding, weighted average grant-date fair value (in dollars per share) $ 5.79  
Outstanding, aggregated intrinsic value $ 33,456 $ 283,541
Granted, units (in shares) 59,073  
Granted, weighted average grant-date fair value (in dollars per share) $ 8.90  
Vested and settled with share issuance, units (in shares) (41,912)  
Vested and settled with share issuance, weighted average grant-date fair value (in dollars per share) $ (5.65)  
Forfeited, units (in shares) 0  
Forfeited, weighted average grant-date fair value (in dollars per share) $ 0  
Outstanding, units (in shares) 145,460 128,299
Outstanding, weighted average grant-date fair value (in dollars per share) $ 7.09 $ 5.79