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

Area of rental space.

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Represents the amount of remediation costs.

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

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The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue.

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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The number of units (items of property) under operating lease arrangements.

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No definition available.

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