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Note 15 - Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Net Funded Status [Table Text Block]
 
 
2016
(1)
 
 
2015
(1)
 
                 
Plan Funded Status per valuation report
    
109.34
 %    
110.69
 %