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Note 4 - Stock-based Compensation - Stock Option Activity (Details)
 9 Months Ended
Sep. 30, 2021
$ / shares
shares
Sep. 30, 2020
shares
Outstanding, Shares (in shares) | shares 17,500  
Outstanding, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 6.97  
Granted, Shares (in shares) | shares 10,000 10,000
Granted, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 11.50  
Exercised, Shares (in shares) | shares (3,833) 0
Exercised, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 8.78  
Expired and forfeited, Shares (in shares) | shares (1,000)  
Expired and forfeited, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 10.75  
Outstanding, Shares (in shares) | shares 22,667  
Outstanding, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 8.50  
Exercisable, Shares (in shares) | shares 5,166  
Exercisable, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 6.54