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Note 8 - Stock Based Compensation - Summary of Non-vested Stock Options (Details) - $ / shares
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Non-vested, shares (in shares) 2,188 5,417
Non-vested, Weighted average exercise price per share (in dollars per share) $ 5.50 $ 5.48
Non-vested, Weighted average grant date fair value (in dollars per share) $ 3.05 $ 3.01
Vested, shares (in shares) (2,188) (3,229)
Vested, Weighted average exercise price per share (in dollars per share) $ 5.50 $ 5.47
Vested, Weighted average grant date fair value (in dollars per share) $ 3.05 $ 2.98
Non-vested, shares (in shares) 0 2,188
Non-vested, Weighted average exercise price per share (in dollars per share) $ 0 $ 5.50
Non-vested, Weighted average grant date fair value (in dollars per share) $ 0 $ 3.05