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Note 6 - Equity Incentive Plan - Granted and Exercised Stock-based Compensation Awards (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Employee Stock Option [Member]        
Grants:        
Stock options (in shares) 17,500 5,500 209,800 410,135
Exercises:        
Stock options (in shares) 273,123 3,850 284,548 9,437
Restricted Stock [Member]        
Grants:        
Restricted stock grants (in shares) 64,578
Restricted Stock Units (RSUs) [Member]        
Grants:        
Restricted stock grants (in shares) 8,130 9,970
Stock Appreciation Rights (SARs) [Member]        
Exercises:        
SARs (in shares) 5,000