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Note 9 - Stock Compensation Plans - RSU Activity (Details) - Restricted Stock Units (RSUs) [Member] - shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Non-vested grants (in shares) 324,250 488,500
Granted (in shares) 173,000 40,000
Vested (in shares) (296,250) (193,250)
Forfeited (in shares) (18,000) (11,000)
Non-vested grants (in shares) 183,000 324,250