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Note 9 - Share-based Compensation and Employee Benefit Plan - Restricted Shares (Details) - Restricted Stock [Member] - $ / shares
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2022
Dec. 31, 2021
Unvested at beginning of period (in shares) 17,798 21,468 21,468
Unvested at beginning of period, weighted average grant date fair value (in dollars per share) $ 6.88 $ 6.48 $ 6.48
Unvested at beginning of period (in shares) 18,498    
Unvested at beginning of period, weighted average grant date fair value (in dollars per share) $ 7.29    
Vested (in shares) (700)    
Vested, weighted average grant date fair value (in dollars per share) $ 17.85    
Unvested at end of period (in shares) 17,798    
Unvested at end of period, weighted average grant date fair value (in dollars per share) $ 6.88