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Note 10 - Stock Ownership Plans - Summary of Stock Option Activity (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Dec. 27, 2020
USD ($)
$ / shares
shares
Outstanding, Shares (in shares) | shares 413
Outstanding, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 1.14
Exercised, Shares (in shares) | shares 0
Exercised, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 0
Cancelled, Shares (in shares) | shares 0
Cancelled, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 0
Outstanding, Shares (in shares) | shares 413
Outstanding, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 1.14
Outstanding, Weighted Average Remaining Contractual Term (Year) 1 year 4 months 24 days
Outstanding, Aggregate Intrinsic Value | $ $ 50
Exercisable, Shares (in shares) | shares 413
Exercisable, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 1.14
Exercisable, Weighted Average Remaining Contractual Term (Year) 1 year 4 months 24 days
Exercisable, Aggregate Intrinsic Value | $ $ 50