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Note 12 - Changes to the Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 27, 2020
Jun. 29, 2019
Jun. 27, 2020
Jun. 29, 2019
Balance $ 833,068 $ 785,115 $ 833,751 $ 759,091
Balance 810,600 809,667 810,600 809,667
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]        
Balance (16,099) (13,044)   (12,079)
Other comprehensive income (loss) before reclassifications 41 496   (469)
Amounts reclassified from accumulated other comprehensive income   0   0
Balance (16,058) (12,548) (16,058) (12,548)
AOCI Attributable to Parent [Member]        
Balance (16,099) (13,044) (12,988) (11,994)
Other comprehensive income (loss) before reclassifications   496 (3,070) (469)
Amounts reclassified from accumulated other comprehensive income   0   (85)
Balance $ (16,058) (12,548) $ (16,058) (12,548)
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