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Note 16 - Accumulated Other Comprehensive Income - Components of Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Balance $ 339,057 $ 343,017 $ 351,374
Other comprehensive income (loss), net 1,415 3,236 358
Balance 350,714 339,057 343,017
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]      
Balance (544) (3,885) (4,266)
Other comprehensive income (loss) before reclassifications 972 647 471
Reclassified from AOCI 413 2,694 (90)
Other comprehensive income (loss), net 1,385 3,341 381
Balance 975 (544) (3,885)
Reclassification of certain tax effects 134    
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]      
Balance (1,467) (1,362) (1,339)
Other comprehensive income (loss) before reclassifications (132) (276) (226)
Reclassified from AOCI 162 171 203
Other comprehensive income (loss), net 30 (105) (23)
Balance (1,815) (1,467) (1,362)
Reclassification of certain tax effects (378)    
AOCI Attributable to Parent [Member]      
Balance (2,011) (5,247) (5,605)
Other comprehensive income (loss) before reclassifications 840 371 245
Reclassified from AOCI 575 2,865 113
Other comprehensive income (loss), net 1,415 3,236 358
Balance (840) $ (2,011) $ (5,247)
Reclassification of certain tax effects $ (244)