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Note 7 - Stock Based Compensation - Summary of Restricted Stock Activity (Details) - $ / shares
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Vested, shares (in shares) (13,000) (13,000)
Restricted Stock [Member]    
Non-vested, shares (in shares) 196  
Non-vested, Weighted average grant date price (in dollars per share) $ 11.26  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 78  
Granted, Weighted average grant date price (in dollars per share) $ 17.65  
Vested, shares (in shares) (19)  
Vested, Weighted average grant date price (in dollars per share) $ 8.91  
Non-vested, shares (in shares) 255 196
Non-vested, Weighted average grant date price (in dollars per share) $ 13.37 $ 11.26