Note K - Stockholders' Equity - Accumulated Other Comprehensive Income (Loss), Net of Tax (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Dec. 30, 2016	Sep. 30, 2016	Mar. 25, 2016	Dec. 25, 2015	Sep. 25, 2015
Balance			$ 117,053			$ 140,167
Balance	$ 110,166			$ 131,003
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	1,577	$ 5,785	5,158	2,622	$ 4,953	6,740
Translation adjustment during the quarter	1,142	(4,208)	627	1,939	(2,331)	(1,787)
Amounts reclassified from accumulated other comprehensive income
Net current period other comprehensive income	1,142	(4,208)	627	1,939	(2,331)	(1,787)
Balance	2,719	1,577	5,785	4,561	2,622	4,953
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(47,879)	(48,629)	(49,301)	(40,677)	(41,482)	(42,221)
Translation adjustment during the quarter
Amounts reclassified from accumulated other comprehensive income	682	750	672	671	805	739
Net current period other comprehensive income	682	750	672	671	805	739
Balance	$ (47,197)	$ (47,879)	$ (48,629)	$ (40,006)	$ (40,677)	$ (41,482)