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Note 3 - Investments in Associated Companies - Summarized Financial Results (Details) - USD ($)
 3 Months Ended 9 Months Ended
Jun. 27, 2021
Jun. 28, 2020
Jun. 27, 2021
Jun. 28, 2020
Operating revenue $ 196,490,000 $ 182,528,000 $ 600,736,000 $ 426,238,000
Operating expenses 184,396,000 171,621,000 562,631,000 386,168,000
Operating income 13,783,000 11,749,000 43,007,000 43,843,000
Equity in earnings 1,689,000 842,000 4,902,000 3,773,000
Restructuring costs 1,419,000 2,865,000 5,880,000 6,422,000
Depreciation and amortization 10,836,000 11,201,000 33,794,000 25,196,000
Net income 3,737,000 (727,000) 19,532,000 2,000
TNI Partners [Member]        
Operating revenue 8,389,000 8,222,000 26,548,000 28,602,000
Operating expenses 6,077,000 6,645,000 19,506,000 22,576,000
Operating income 2,312,000 1,577,000 7,042,000 6,026,000
Company's 50% share of operating income 1,156,000 789,000 3,521,000 3,013,000
Less amortization of intangible assets 0 0 0 209,000
Equity in earnings 1,156,000 789,000 3,521,000 2,804,000
MNI [Member]        
Operating revenue 11,479,000 10,875,000 34,425,000 37,125,000
Operating expenses 8,657,000 10,542,000 29,324,000 34,222,000
Operating income 2,634,000 161,000 4,515,000 2,389,000
Equity in earnings 533,000 54,000 1,381,000 969,000
Restructuring costs 0 0 106,000 0
Depreciation and amortization 188,000 172,000 480,000 514,000
Net income $ 1,066,000 $ 107,000 $ 2,762,000 $ 1,938,000