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Note 10 - Stock Ownership Plans - Summary of Stock Options Outstanding (Details)
12 Months Ended
Sep. 29, 2019
$ / shares
shares
Number outstanding (in shares) | shares 809
Weighted Average Remaining Contractual Life (Year) 1 year 328 days
Weighted Average Exercise Price, Outstanding (in dollars per share) $ 1.82
Number Exercisable (in shares) | shares 809
Weighted Average Exercise Price, Exercisable (in dollars per share) $ 1.82
Exercise Price Range 1 [Member]  
Range of exercise prices, lower limit (in dollars per share) 1
Range of exercise prices, upper limit (in dollars per share) $ 2
Number outstanding (in shares) | shares 425
Weighted Average Remaining Contractual Life (Year) 2 years 255 days
Weighted Average Exercise Price, Outstanding (in dollars per share) $ 1.14
Number Exercisable (in shares) | shares 425
Weighted Average Exercise Price, Exercisable (in dollars per share) $ 1.14
Exercise Price Range 2 [Member]  
Range of exercise prices, lower limit (in dollars per share) 2
Range of exercise prices, upper limit (in dollars per share) $ 3
Number outstanding (in shares) | shares 384
Weighted Average Remaining Contractual Life (Year) 1 year
Weighted Average Exercise Price, Outstanding (in dollars per share) $ 2.57
Number Exercisable (in shares) | shares 384
Weighted Average Exercise Price, Exercisable (in dollars per share) $ 2.57