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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

X
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- Definition Weighted average price at which grantees could acquire or could have acquired the underlying shares with respect to any other type of change in shares reserved for issuance. + References No definition available. + Details
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