Note 5 - Contracts in Progress - Long-term Contracts (Details) - USD ($)	Nov. 30, 2017	Nov. 30, 2016
Costs in Excess of Billings, Cost	$ 105,639	$ 121,118
Billings in Excess of Costs, Costs	612,370	159,717
Costs in Excess of Billings, Estimated Earnings	34,611	27,231
Billings in Excess of Costs, Estimated Earnings	173,764	65,471
Costs in Excess of Billings, Costs and Estimated Earnings	140,250	148,349
Billings in Excess of Costs, Costs and Estimated Earnings	786,134	225,188
Costs in Excess of Billings, Amounts Billed	(75,104)	(40,000)
Billings in Excess of Costs, Amounts Billed	(834,345)	(229,485)
Cost and Profit in Excess of Billings	65,146	108,349
Billings in Excess of Cost	$ (48,211)	$ (4,297)