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Note 3 - Earnings Per Common Share (EPS) (Details Textual) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Share-based Payment Arrangement, Option [Member]        
Number of Option Shares Excluded from Weighted Average Common Shares Outstanding (in shares) 22,667   22,667  
Weighted Average Exercise Price Options Excluded From Weighted Average Common Share Outstanding (in dollars per share) $ 8.49   $ 8.49  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)   17,500   17,500
Antidilutive Securities Excluded from Computation of Net Income, Per Outstanding Unit, Amount (in dollars per share)   $ 6.97   $ 6.97
Restricted Stock Units (RSUs) [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 86,810   86,810