Note 4 - Contracts in Progress - Long-term Contracts (Details) - USD ($)	Nov. 30, 2020	Nov. 30, 2019
Costs in Excess of Billings, Cost	$ 511,152	$ 3,805,906
Billings in Excess of Costs, Costs	9,697,061	629,501
Costs in Excess of Billings, Estimated Earnings	98,084	1,044,612
Billings in Excess of Costs, Estimated Earnings	579,747	155,790
Costs in Excess of Billings, Costs and Estimated Earnings	609,236	4,850,518
Billings in Excess of Costs, Costs and Estimated Earnings	10,276,808	785,291
Costs in Excess of Billings, Amounts Billed	(553,210)	(4,123,851)
Billings in Excess of Costs, Amounts Billed	(10,553,034)	(874,222)
Cost and Profit in Excess of Billings	56,026	726,667
Billings in Excess of Cost	$ (276,226)	$ (88,931)