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Note 8 - Stock Based Compensation - Summary of Stock Options (Details)
 12 Months Ended
Dec. 31, 2021
$ / shares
shares
Dec. 31, 2020
$ / shares
shares
Outstanding, shares (in shares) 17,082 29,165
Outstanding, Weighted average exercise price per shar (in dollars per share) | $ / shares $ 6.10 $ 7.20
Outstanding, Weighted average grant date fair value 3.36 3.76
Forfeited, shares (in shares)   (12,083)
Forfeited, Weighted average exercise price per share (in dollars per share) | $ / shares   $ 8.76
Forfeited, Weighted average grant date fair value   4.34
Exercised, shares (in shares) (4,166)  
Exercised, Weighted average exercise price per share 8.04  
Exercised, Weighted average grant date fair value 4.34  
Outstanding, shares (in shares) 12,916 17,082
Outstanding, Weighted average exercise price per shar (in dollars per share) | $ / shares $ 5.47 $ 6.10
Outstanding, Weighted average grant date fair value 2.98 3.36