Note 3 - Investments in Associated Companies - Summarized Financial Results (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 27, 2022	Mar. 28, 2021	Mar. 27, 2022	Mar. 28, 2021
Operating revenue	$ 190,014	$ 192,430	$ 392,296	$ 404,248
Operating expenses	194,649	185,483	373,571	378,235
Operating income	(3,228)	8,418	21,886	29,226
Equity in earnings	1,407	1,471	3,161	3,213
Restructuring costs	10,590	1,294	13,790	4,461
Depreciation and amortization	8,951	12,517	18,627	22,958
Net income	(6,694)	(608)	6,505	15,795
TNI Partners [Member]
Operating revenue	8,594	8,759	17,575	18,159
Operating expenses	6,409	6,424	12,873	13,429
Operating income	2,185	2,335	4,702	4,730
Company's 50% share of operating income	1,093	1,168	2,351	2,365
Equity in earnings	1,093	1,168	2,351	2,365
MNI [Member]
Operating revenue	11,561	11,024	23,756	22,946
Operating expenses	10,462	10,237	21,296	20,667
Operating income	929	605	2,120	1,881
Equity in earnings	314	303	810	847
Restructuring costs	0	0	0	106
Depreciation and amortization	170	182	340	292
Net income	$ 627	$ 605	$ 1,620	$ 1,694