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Note 12 - Pension and Other Postretirement Benefit Plans (Details) - Amounts in Accumulated Other Comprehensive Income to be Recognized as Components of Net Periodic Expense for These Plans in 2013
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
Note 12 - Pension and Other Postretirement Benefit Plans (Details) - Amounts in Accumulated Other Comprehensive Income to be Recognized as Components of Net Periodic Expense for These Plans in 2013 [Line Items]  
Net Actuarial loss (gain) $ 769
Prior Service cost (credit) (45)
Total 724
Retirement Plan [Member]  
Note 12 - Pension and Other Postretirement Benefit Plans (Details) - Amounts in Accumulated Other Comprehensive Income to be Recognized as Components of Net Periodic Expense for These Plans in 2013 [Line Items]  
Net Actuarial loss (gain) 808
Total 808
Other Postretirement Benefit Plan [Member]  
Note 12 - Pension and Other Postretirement Benefit Plans (Details) - Amounts in Accumulated Other Comprehensive Income to be Recognized as Components of Net Periodic Expense for These Plans in 2013 [Line Items]  
Net Actuarial loss (gain) 47
Prior Service cost (credit) (85)
Total (38)
Directors' Plan [Member]  
Note 12 - Pension and Other Postretirement Benefit Plans (Details) - Amounts in Accumulated Other Comprehensive Income to be Recognized as Components of Net Periodic Expense for These Plans in 2013 [Line Items]  
Net Actuarial loss (gain) (86)
Prior Service cost (credit) 40
Total $ (46)