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Note 12 - Changes to the Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 28, 2020
Mar. 30, 2019
Mar. 28, 2020
Mar. 30, 2019
Balance $ 842,520 $ 768,545 $ 833,751 $ 759,091
Balance 833,068 785,115 833,068 785,115
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]        
Balance (12,178) (13,438) (12,988) (12,079)
Other comprehensive income (loss) before reclassifications (3,921) 394 (3,111) (965)
Amounts reclassified from accumulated other comprehensive income   0   0
Balance (16,099) (13,044) (16,099) (13,044)
AOCI Attributable to Parent [Member]        
Balance (12,178) (13,438) (12,988) (11,994)
Other comprehensive income (loss) before reclassifications (3,921) 394 (3,111) (965)
Amounts reclassified from accumulated other comprehensive income   0   (85)
Balance $ (16,099) (13,044) $ (16,099) (13,044)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]        
Balance   0   85
Other comprehensive income (loss) before reclassifications   0   0
Amounts reclassified from accumulated other comprehensive income   0   (85)
Balance   $ 0   $ 0