Note 11 - Stock Ownership Plans - Summary of Restricted Stock Activity (Details) - Restricted Stock [Member] shares in Thousands	6 Months Ended
	Mar. 29, 2020 $ / shares shares
Outstanding, shares (in shares) | shares	1,477
Outstanding, weighted average grant date fair value (in dollars per share) | $ / shares	$ 2.49
Vested, shares (in shares) | shares	(601)
Vested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 1.94
Granted, shares (in shares) | shares	720
Granted, weighted average grant date fair value (in dollars per share) | $ / shares	$ 1.62
Cancelled, shares (in shares) | shares	(24)
Cancelled, weighted average grant date fair value (in dollars per share) | $ / shares	$ 2.49
Outstanding, shares (in shares) | shares	1,572
Outstanding, weighted average grant date fair value (in dollars per share) | $ / shares	$ 2.15