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Note 13 - Stockholders' Equity - Components of Accumulated Other Comprehensive Loss and Changes During the Year (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Beginning balance, net of tax $ (8,362) $ (5,562) $ (2,907)
Other comprehensive income (loss) before reclassifications, net of tax (1,055) (2,217) (3,203)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 431 (583) 548
Total other comprehensive income (loss), net of tax (624) (2,800) (2,655)
Ending balance, net of tax (8,986) (8,362) (5,562)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]      
Beginning balance, net of tax (3,859) (521) 3,392
Other comprehensive income (loss) before reclassifications, net of tax (1,771) (2,452) (3,818)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 108 (886) (95)
Total other comprehensive income (loss), net of tax (1,663) (3,338) (3,913)
Ending balance, net of tax (5,522) (3,859) (521)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]      
Beginning balance, net of tax    
Other comprehensive income (loss) before reclassifications, net of tax 231    
Amounts reclassified from accumulated other comprehensive income (loss), net of tax    
Total other comprehensive income (loss), net of tax 231    
Ending balance, net of tax 231  
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]      
Beginning balance, net of tax (4,503) (5,041) (6,299)
Other comprehensive income (loss) before reclassifications, net of tax 485 235 615
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 323 303 643
Total other comprehensive income (loss), net of tax 808 538 1,258
Ending balance, net of tax $ (3,695) $ (4,503) $ (5,041)