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Note 14 - Accumulated Other Comprehensive Income (Details) - Amounts Reclassified Out of Accumulated Other Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Note 14 - Accumulated Other Comprehensive Income (Details) - Amounts Reclassified Out of Accumulated Other Comprehensive Income [Line Items]        
Unrealized gains on available for sale securities tax $ (9,521) $ (7,598) $ (15,067) $ (14,525)
Unrealized gains on available for sale securities 14,834 11,685 23,567 21,981
Amortization of defined benefit pension items:        
Tax benefit 9,521 7,598 15,067 14,525
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]        
Note 14 - Accumulated Other Comprehensive Income (Details) - Amounts Reclassified Out of Accumulated Other Comprehensive Income [Line Items]        
Unrealized gains on available for sale securities before tax 64   64  
Unrealized gains on available for sale securities tax (28)   (28)  
Unrealized gains on available for sale securities 36   36  
Amortization of defined benefit pension items:        
Tax benefit 28   28  
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Note 14 - Accumulated Other Comprehensive Income (Details) - Amounts Reclassified Out of Accumulated Other Comprehensive Income [Line Items]        
Unrealized gains on available for sale securities tax (130) (72) (258) (176)
Amortization of defined benefit pension items:        
Actuarial losses [1] (306) (175) (613) (350)
Prior service credits [1] 12 12 23 23
Total before tax (294) (163) (590) (327)
Tax benefit 130 72 258 176
Net of tax $ (164) $ (91) $ (332) $ (151)
[1] These accumulated other comprehensive income components are included in the computation of net periodic pension cost (See Note 10 of the Notesto Consolidated Financial Statements "Pension and Other Postretirement Benefit Plans".)