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Note 6 - Stock-based Compensation (Tables)
 6 Months Ended
Jun. 30, 2016
Notes Tables  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
Risk-free interest rate
     1.29 %
Expected life (in years)
     6  
Dividend yield
     1.14  
Expected volatility
     30.7 %
Forfeiture rate:
        
Senior management
     0.0 %
Other employees
     10.5 %
Sub-Optimal Exercise Factor:
        
Senior management
     2.5  
Other employees
     2.0