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Note 12 - Stockholders' Equity - Share Incentive Plan Activity (Details) - Restricted Stock Units (RSUs) [Member] - USD ($)
12 Months Ended 54 Months Ended
Dec. 31, 2021
Dec. 31, 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     $ 283,541
Granted, units (in shares) 71,582 52,941  
Granted, weighted average grant-date fair value (in dollars per share) $ 7.51    
Vested and settled with share issuance, units (in shares) (50,245)    
Vested and settled with share issuance, weighted average grant-date fair value (in dollars per share) $ (5.85)    
Outstanding, units (in shares) 149,636 149,636  
Outstanding, weighted average grant-date fair value (in dollars per share) $ 6.59 $ 6.59