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Note 14 - Equity Incentive Plan - Granted and Exercised Stock-based Compensation Awards (Details) - shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Share-based Payment Arrangement, Option [Member]    
Grants:    
Stock options (in shares) 546,496 254,517
Exercises:    
Stock options (in shares) 123,063 518,991
Restricted Stock Units (RSUs) [Member]    
Grants:    
Restricted stock grants (in shares) 218,804 189,507
Performance Restricted Stock Units [Member]    
Grants:    
Restricted stock grants (in shares) 162,297 123,500
Stock Appreciation Rights (SARs) [Member]    
Exercises:    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised (in shares) 0 35,250