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Note 9 - Lease Commitments (Details Textual)			12 Months Ended
	Nov. 30, 2016 USD ($) a	Feb. 29, 2016 USD ($) ft²	Apr. 30, 2019 USD ($)	Apr. 30, 2018 USD ($)	Apr. 30, 2017 USD ($)	Sep. 30, 2021 USD ($)	Oct. 30, 2016 USD ($)	Jul. 29, 2016 ft²
Operating Leases, Rent Expense, Total			$ 1,278,000	$ 1,246,000	$ 1,677,000
Sublease to American Building Maintenance Industries, Incorporated [Member]
Area of Real Estate Property | a	24,726
Operating Leases, Annual Base Rent	$ 1,126,000
Base Rent Increase, Percent	2.25%
Security Deposit							$ 469,000
Annual Rental Expenditure, Initial, Decrease, Percentage	23.00%
Lessee Leasing Arrangements, Allowance	$ 417,000
Lessee Leasing Arrangements, Allowance, Six Months of Free Rent Payment	$ 563,000
Sublease to American Building Maintenance Industries, Incorporated [Member] | Forecast [Member]
Security Deposit						$ 305,000
Seagis Property Group LP (the "Landlord") [Member]
Area of Real Estate Property | ft²								24,110
Seagis Property Group LP (the "Landlord") [Member] | Value Line Distribution Center ("VLDC") [Member]
Area of Real Estate Property | ft²		24,110
Operating Leases, Annual Base Rent		$ 192,880
Security Deposit		32,146
Base Rent Increase Amount		$ 237,218

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- Definition

Area of a real estate property.

+ References

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- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

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- Definition

The amount of an asset, typically cash, provided to a counterparty to provide certain assurance of performance by the entity pursuant to the terms of a written or oral agreement, such as a lease.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.8,17)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

The initial percentage that the annual rent expenditure will be decreased by.

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- Definition

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- Definition

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+ References

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- Definition

The total amount of free rent offered for six months accompanying an allowance arrangement.

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- Definition

The amount of base rent per annum during the period for an operating lease.

+ References

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