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Note 7 - Assets Held for Lease (Details Textual) |  | 12 Months Ended
--- | --- | ---
Dec. 14, 2018 USD ($) | Nov. 30, 2018 USD ($) ft² | Nov. 30, 2017 USD ($)
Proceeds from Sale of Property, Plant, and Equipment, Total |  | $ 52,606 | $ 43,481
Asset Impairment Charges, Total |  | 591,268 | 70,000
Sales [Member] |  |  |
Operating Leases, Income Statement, Lease Revenue, Total |  | 374,000 | 161,000
Other Nonoperating Income (Expense) [Member] |  |  |
Operating Leases, Income Statement, Lease Revenue, Total |  | 44,000 | $ 234,000
West Union Facility [Member] |  |  |
Remediation Cost |  | 235,000 |
Inventory Write-down |  | $ 67,000 |
Area of Rental Space | ft² |  | 20,000 |
Asset Impairment Charges, Total |  | $ 216,000 |
West Union Facility [Member] | Subsequent Event [Member] |  |  |
Proceeds from Sale of Property, Plant, and Equipment, Total | $ 900,000 |  |
Modular Buildings [Member] |  |  |
Property Subject to or Available for Operating Lease, Number of Units |  | 7 | 1

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