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Note 3 - Investments in Associated Companies - Summarized Financial Results (Details) - USD ($)
 3 Months Ended 6 Months Ended
Mar. 28, 2021
Mar. 29, 2020
Mar. 28, 2021
Mar. 29, 2020
Operating revenue $ 192,430,000 $ 121,367,000 $ 404,248,000 $ 243,710,000
Operating expenses 185,483,000 108,942,000 378,235,000 214,548,000
Operating income 8,418,000 13,787,000 29,226,000 32,093,000
Equity in earnings 1,471,000 1,362,000 3,213,000 2,931,000
Restructuring costs 1,294,000 1,925,000 4,461,000 3,557,000
Depreciation and amortization 12,517,000 7,276,000 22,958,000 13,995,000
Net income (608,000) (4,990,000) 15,795,000 728,000
TNI Partners [Member]        
Operating revenue 8,759,000 10,185,000 18,159,000 20,381,000
Operating expenses 6,424,000 7,766,000 13,429,000 15,931,000
Operating income 2,335,000 2,419,000 4,730,000 4,450,000
Company's 50% share of operating income 1,168,000 1,210,000 2,365,000 2,225,000
Less amortization of intangible assets 0 105,000 0 210,000
Equity in earnings 1,168,000 1,105,000 2,365,000 2,015,000
MNI [Member]        
Operating revenue 11,024,000 12,325,000 22,946,000 26,250,000
Operating expenses 10,237,000 11,561,000 20,667,000 23,681,000
Operating income 605,000 567,000 1,881,000 2,228,000
Equity in earnings 303,000 257,000 847,000 915,000
Restructuring costs 0 0 106,000 0
Depreciation and amortization 182,000 197,000 292,000 341,000
Net income $ 605,000 $ 514,000 $ 1,694,000 $ 1,830,000