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Note 5 - Accumulate Other Comprehensive Income - Changes in Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2017
Jun. 30, 2016
Amount reclassified from accumulated other comprehensive income [1] $ (322) $ (166) $ (34)    
Period change 783 [1] (169) [1] 1,159 [1] 326 [1] $ 614 $ 1,485
Balance [1] 1,815 1,032 3,880 2,721 1,815 3,880
Balance [1] 1,032 1,201 2,721 2,395 $ 1,201 $ 2,395
Other comprehensive income before reclassification [1] 783 153 1,325 360    
Amount reclassified from accumulated other comprehensive income [1] $ (322) $ (166) $ (34)    
[1] All amounts are net of tax. Amounts in parentheses indicate debits to accumulated other comprehensive income.