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Note 13 - Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income by Component (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Beginning balance, net of tax $ (8,986) $ (8,362)
Reclassification of the Income Tax Effects of the Tax Cuts and Jobs Act from Accumulated Other Comprehensive Income (Loss) to Retained Earnings  
Impact of adoption of Accounting Standard Update 2016-01  
Other comprehensive income before reclassifications, net of tax (1,159) 1,148
Amounts reclassified from accumulated other comprehensive income, net of tax 264 80
Total other comprehensive income (loss), net of tax (895) 1,228
Ending balance, net of tax (11,179) (7,134)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]    
Beginning balance, net of tax (5,522) (3,859)
Reclassification of the Income Tax Effects of the Tax Cuts and Jobs Act from Accumulated Other Comprehensive Income (Loss) to Retained Earnings (1,325)  
Impact of adoption of Accounting Standard Update 2016-01  
Other comprehensive income before reclassifications, net of tax (6,640) 1,148
Amounts reclassified from accumulated other comprehensive income, net of tax
Total other comprehensive income (loss), net of tax (6,640) 1,148
Ending balance, net of tax (13,487) (2,711)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]    
Beginning balance, net of tax 231  
Reclassification of the Income Tax Effects of the Tax Cuts and Jobs Act from Accumulated Other Comprehensive Income (Loss) to Retained Earnings 50  
Impact of adoption of Accounting Standard Update 2016-01  
Other comprehensive income before reclassifications, net of tax 5,481  
Amounts reclassified from accumulated other comprehensive income, net of tax 180  
Total other comprehensive income (loss), net of tax 5,661  
Ending balance, net of tax 5,942  
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]    
Beginning balance, net of tax (3,695) (4,503)
Reclassification of the Income Tax Effects of the Tax Cuts and Jobs Act from Accumulated Other Comprehensive Income (Loss) to Retained Earnings (798)  
Impact of adoption of Accounting Standard Update 2016-01  
Other comprehensive income before reclassifications, net of tax
Amounts reclassified from accumulated other comprehensive income, net of tax 84 80
Total other comprehensive income (loss), net of tax 84 80
Ending balance, net of tax (4,409) (4,423)
Accumulated Gain (Loss), Financial Liability, Fair Value Option, Attributable to Parent [Member]    
Beginning balance, net of tax  
Reclassification of the Income Tax Effects of the Tax Cuts and Jobs Act from Accumulated Other Comprehensive Income (Loss) to Retained Earnings  
Impact of adoption of Accounting Standard Update 2016-01 775  
Other comprehensive income before reclassifications, net of tax  
Amounts reclassified from accumulated other comprehensive income, net of tax  
Total other comprehensive income (loss), net of tax  
Ending balance, net of tax 775  
AOCI Attributable to Parent [Member]    
Reclassification of the Income Tax Effects of the Tax Cuts and Jobs Act from Accumulated Other Comprehensive Income (Loss) to Retained Earnings (2,073)  
Impact of adoption of Accounting Standard Update 2016-01 775  
Total other comprehensive income (loss), net of tax $ (895) $ 1,228