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Note 17 - Net Earnings Per Common Share - Reconciliation of the Denominator Used to Calculate Earnings Per Common Share (Details) - shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Shares issued and outstanding at beginning of period (in shares)   41,495,957 35,980,047
Stock Issued During Period, Shares, New Issues (in shares) 1,260,042 2,245,229  
Weighted average number of shares used in computing basic earnings per share (in shares) 42,755,999 38,225,276  
Assumed exercise of stock options, net of shares assumed acquired under the Treasury Stock Method (in shares) 428,098 437,204  
Number of shares used in computing diluted earnings per share (in shares) 43,184,097 38,662,480