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Note 5 - Accumulated Other Comprehensive Income (Details) - Changes in Accumulated Other Comprehensive Income (Loss) by Component Net of Tax (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 30, 2013
Changes in Accumulated Other Comprehensive Income (Loss) by Component Net of Tax [Abstract]              
Balance $ 859 [1] $ (190) [1] $ (2,237) $ 5,391 [1] $ (2,237) $ 5,391 [1] $ (2,237) [1]
Period change 766 [1] (1,503) [1] 3,096 [1] (5,581) [1] 3,862 (7,084)  
Balance 1,625 [1] (1,693) [1] 859 [1] (190) [1] 1,625 [1] (1,693) [1] (2,237) [1]
Other comprehensive Income (loss) before reclassification 892 [1] (1,503) [1] 3,134 [1] (5,466) [1]      
Amount reclassified from accumulated other comprehensive income (loss) $ (126) [1]    [1] $ (38) [1] $ (115) [1]      
[1] All amounts are net of tax. Amounts in parentheses indicate debits.