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Note 7 - Postretirement and Postemployment Benefits - Benefit Obligations and Plan Assets (Details) - Other Postretirement Benefits Plan [Member] - USD ($)
$ in Thousands
 12 Months Ended
Sep. 29, 2019
Sep. 30, 2018
Benefit obligation, beginning of year $ 11,756 $ 15,667
Service cost
Interest cost 412 365
Actuarial loss (gain) 1,033 (1,054)
Benefits paid, net of premiums received (1,507) (1,399)
Curtailment (1,924)
Medicare Part D subsidies 58 101
Benefit obligation, end of year 11,752 11,756
Fair value of plan assets, beginning of year: 24,647 24,626
Actual return on plan assets 2,097 2,106
Employer contributions 222 422
Benefits paid, net of premiums and Medicare Part D subsidies received (1,449) (1,298)
Benefits paid for active employees (1,382) (1,209)
Fair value of plan assets, end of year 24,135 24,647
Funded status $ 12,383 $ 12,891