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Note 13 - Net Earnings Per Common Share (Tables)
12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
    2016   2015
         
Shares issued and outstanding at beginning of period    
35,939,011
     
35,970,605
 
Weighted average number of shares:                
Issued during the period    
72,023
     
129,867
 
Repurchased during the period    
(45,247
)    
(87,214
)
Weighted average number of shares used in computing basic earnings per share    
35,965,787
     
36,013,258
 
Assumed exercise of stock options, net of shares assumed acquired under the Treasury Stock Method    
399,997
     
411,769
 
Number of shares used in computing diluted earnings per share    
36,365,784
     
36,425,027