Note 5 - Contracts in Progress - Long-term Contracts (Details) - USD ($)	Nov. 30, 2016	Nov. 30, 2015
Costs in Excess of Billings, Cost	$ 121,118	$ 233,544
Billings in Excess of Costs, Costs	159,717	695,915
Costs in Excess of Billings, Estimated Earnings	27,231	75,822
Billings in Excess of Costs, Estimated Earnings	65,471	227,442
Costs in Excess of Billings, Costs and Estimated Earnings	148,349	309,366
Billings in Excess of Costs, Costs and Estimated Earnings	225,188	923,357
Costs in Excess of Billings, Amounts Billed	(40,000)	(102,694)
Billings in Excess of Costs, Amounts Billed	(229,485)	(1,010,215)
Cost and Profit in Excess of Billings	108,349	206,672
Billings in Excess of Cost	$ (4,297)	$ (86,858)