Note 7 - Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)	Sep. 26, 2023	Sep. 27, 2022
Tax effect of net operating loss carry-forward	$ 3,622,000	$ 3,942,000
General business credits	6,262,000	5,225,000
Deferred revenue	29,000	50,000
Intangibles basis differences	925,000	398,000
Long-term lease liability	10,613,000	11,113,000
Other future benefits	668,000	666,000
Deferred tax assets	22,119,000	21,394,000
Less valuation allowance	0	(10,535,000)
Deferred tax assets, net of valuation allowance	22,119,000	10,859,000
Partnership/joint venture basis differences	(64,000)	(30,000)
Property and Equipment basis differences	(1,731,000)	(1,424,000)
ROU asset	(8,741,000)	(9,225,000)
Other future expense	0	(180,000)
Deferred tax liabilities	(10,536,000)	(10,859,000)
Net deferred tax assets (liabilities)	$ 11,583,000	$ 0