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Note 13 - Equity Incentive Plan - Granted and Exercised Stock-based Compensation Awards (Details) - shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Employee Stock Option [Member]    
Grants:    
Stock options (in shares) 199,970 440,688
Exercises:    
Stock options (in shares) 284,548 12,941
Restricted Stock [Member]    
Grants:    
Restricted stock grants (in shares) 64,578 26,306
Restricted Stock Units (RSUs) [Member]    
Grants:    
Restricted stock grants (in shares) 15,457 9,970
Stock Appreciation Rights (SARs) [Member]    
Exercises:    
SARs (in shares) 5,000