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Represents the number of major customers accounting for 10% or more of the specified concentration risk benchmark, which includes, but not limited to, sales revenue, accounts receivable, etc

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The interest rate for overdue trade receivables as a percent of account balances per month.

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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity.

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Cash received for the sale of real estate that is not part of an investing activity during the current period.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Note 1 - Summary of Significant Accounting Policies (Details Textual)		1 Months Ended	3 Months Ended	12 Months Ended
	Mar. 29, 2018 USD ($)	Dec. 31, 2017	Feb. 28, 2018 USD ($)	Dec. 31, 2018	Nov. 30, 2018 USD ($)	Nov. 30, 2017 USD ($)
Proceeds from Sale of Real Estate, Total	$ 1,500,000				$ 1,500,000
Overdue Trade Receivables Interest Rate Percent of Account Balances Per Month					1.50%
Goodwill, Impairment Loss					$ 375,000	$ 0
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		35.00%			21.00%	34.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability			$ 298,000		$ 298,000
Revenues, Total					19,726,793	$ 20,715,080
Research and Development Expense, Total					178,000	183,000
Advertising Expense					312,000	356,000
Product [Member]
Revenues, Total					$ 202,000	$ 184,000
Scenario, Forecast [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent				21.00%
Maximum [Member]
Property, Plant and Equipment, Useful Life					40 years
Lessor, Capital Lease, Term of Contract					3 years
Maximum [Member] \| Assets Leased to Others [Member]
Property, Plant and Equipment, Useful Life					5 years
Minimum [Member]
Property, Plant and Equipment, Useful Life					3 years
Minimum [Member] \| Assets Leased to Others [Member]
Property, Plant and Equipment, Useful Life					3 years
Customer Concentration Risk [Member] \| Sales Revenue, Net [Member]
Number Of Major Customers					0	0
Customer Concentration Risk [Member] \| Sales Revenue, Net [Member] \| Maximum [Member]
Concentration Risk, Percentage					6.00%	4.00%