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Note 5 - Accumulated Other Comprehensive Income (Details) - Changes in Accumulated Other Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 30, 2012
Changes in Accumulated Other Comprehensive Income [Abstract]              
Balance $ (190) [1] $ 5,549 [1] $ 5,391 $ 4,541 [1] $ 5,391 $ 4,541 [1] $ 5,391 [1]
Period change (1,503) [1] 453 [1] (5,581) [1] 1,008 [1] (7,084) 1,461  
Other comprehensive loss before reclassification (1,503) [1] 553 [1] (5,466) [1] 1,204 [1]      
Amount reclassified from accumulated other comprehensive income 0 [1] (100) [1] (115) [1] (196) [1]      
Balance $ (1,693) [1] $ 6,002 [1] $ (190) [1] $ 5,549 [1] $ (1,693) [1] $ 6,002 [1] $ 5,391 [1]
[1] All amounts are net of tax. Amounts in parentheses indicate debits.