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Note 8 - Shareholders' Equity - Summary of Nonvested Option Activity (Details) - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Nonvested at January 1, 2020 (in shares) 372    
Nonvested at January 1, 2020 (in dollars per share) $ 9.81    
Granted (in shares) 184 250 249
Granted (in dollars per share) $ 8.64    
Vested (in shares) (183)    
Vested (in dollars per share) $ 9.50    
Forfeited (in shares) 0    
Forfeited (in dollars per share) $ 0    
Nonvested at December 31, 2020 (in shares) 373 372  
Nonvested at December 31, 2020 (in dollars per share) $ 9.39