Note 3 - Business Combination - Assets Acquired and Liabilities Assumed (Details) - USD ($)	Mar. 13, 2020	Mar. 28, 2020	Sep. 28, 2019
Goodwill		$ 9,624,000	$ 8,293,000
STM [Member]
Accounts receivable	$ 3,860,000
Inventories	3,172,000
Other current assets	3,291,000
Property, plant and equipment	11,140,000
Intangibles	870,000
Total assets acquired	22,333,000
Accounts payable	852,000
Accrued expenses	312,000
Total liabilities assumed	1,164,000
Net assets acquired	21,169,000
Business Combination, Consideration Transferred, Total	22,500,000
Goodwill	$ 1,331,000