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Note 13 - Stockholders' Equity - Changes in Accumulated Other Comprehensive Income by Component (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Balance $ 532,608 $ 513,853 $ 473,067
Reclassification of the Income Tax Effects of the Tax Cuts and Jobs Act from AOCL to Retained Earnings 2,073
Total other comprehensive los, net of tax (2,472) (624) (2,800)
Balance 549,464 532,608 513,853
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]      
Balance (5,522) (3,859) (521)
Reclassification of the Income Tax Effects of the Tax Cuts and Jobs Act from AOCL to Retained Earnings (1,325)    
Impact of adoption of Accounting Standard Update 2016-01    
Other comprehensive income before reclassifications, net of tax (10,127) (1,771) (2,452)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 1,325 108 (886)
Total other comprehensive los, net of tax (8,802) (1,663) (3,338)
Balance (15,649) (5,522) (3,859)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]      
Balance 231  
Reclassification of the Income Tax Effects of the Tax Cuts and Jobs Act from AOCL to Retained Earnings 50    
Impact of adoption of Accounting Standard Update 2016-01    
Other comprehensive income before reclassifications, net of tax 3,351 105  
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 72 126  
Total other comprehensive los, net of tax 3,423 231  
Balance 3,704 231
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]      
Balance (3,695) (4,503) (5,041)
Reclassification of the Income Tax Effects of the Tax Cuts and Jobs Act from AOCL to Retained Earnings (798)    
Impact of adoption of Accounting Standard Update 2016-01    
Other comprehensive income before reclassifications, net of tax 2,484 485 235
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 336 323 303
Total other comprehensive los, net of tax 2,820 808 538
Balance (1,673) (3,695) (4,503)
Accumulated Gain (Loss), Financial Liability, Fair Value Option, Attributable to Parent [Member]      
Balance    
Reclassification of the Income Tax Effects of the Tax Cuts and Jobs Act from AOCL to Retained Earnings    
Impact of adoption of Accounting Standard Update 2016-01 779    
Other comprehensive income before reclassifications, net of tax 87    
Amounts reclassified from accumulated other comprehensive income (loss), net of tax    
Total other comprehensive los, net of tax 87    
Balance 866  
AOCI Attributable to Parent [Member]      
Balance (8,986) (8,362) (5,562)
Reclassification of the Income Tax Effects of the Tax Cuts and Jobs Act from AOCL to Retained Earnings (2,073)    
Impact of adoption of Accounting Standard Update 2016-01 779    
Other comprehensive income before reclassifications, net of tax (4,205) (1,181) (2,217)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 1,733 557 (583)
Total other comprehensive los, net of tax (2,472) (624) (2,800)
Balance $ (12,752) $ (8,986) $ (8,362)