Note 4 - Contracts in Progress - Long-term Contracts (Details) - USD ($)	Nov. 30, 2021	Nov. 30, 2020
Costs in Excess of Billings, Cost	$ 362,958	$ 511,152
Billings in Excess of Costs, Costs	924,908	9,697,061
Costs in Excess of Billings, Estimated Earnings	117,328	98,084
Billings in Excess of Costs, Estimated Earnings	301,180	579,747
Costs in Excess of Billings, Costs and Estimated Earnings	480,286	609,236
Billings in Excess of Costs, Costs and Estimated Earnings	1,226,088	10,276,808
Costs in Excess of Billings, Amounts Billed	(303,002)	(553,210)
Billings in Excess of Costs, Amounts Billed	(1,506,849)	(10,553,034)
Cost and Profit in Excess of Billings	177,284	56,026
Billings in Excess of Cost	$ (280,761)	$ (276,226)