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Note 15 - Share-based Compensation - Summary of Awards Pursuant to Stock Option Plans (Details) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2020
Beginning Balance, Shares (in shares) 1,090,968    
Outstanding at beginning of year (in dollars per share) $ 13.11    
Granted, Shares (in shares) 51,000    
Granted, Weighted Average Exercise Price (in dollars per share) $ 20.10    
Exercised, Shares (in shares) (56,498) (200,629)  
Exercised, Weighted Average Exercise Price (in dollars per share) $ 12.61    
Forfeited/cancelled, Shares (in shares) (36,000)    
Forfeited/cancelled, Weighted Average Exercise Price (in dollars per share) $ 18.32    
Beginning Balance, Shares (in shares) 1,049,470 1,090,968  
Outstanding at end of year (in dollars per share) $ 13.11 $ 13.11 $ 13.30
Ending Balance, Weighted Average Remaining Contractual Term (Year) 3 years 6 months 7 days    
Ending Balance, Aggregate Intrinsic Value     $ 189,917
Options exercisable, Shares (in shares)     958,470
Options exercisable, Weighted Average Exercise Price (in dollars per share) $ 12.73    
Options exercisable, Weighted Average Remaining Contractual Term (Year) 3 years 3 days    
Options exercisable, Aggregate Intrinsic Value     $ 189,917