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Note 9 - Lease Commitments (Details Textual) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Nov. 30, 2016 USD ($) ft² | Feb. 29, 2016 USD ($) ft² | Apr. 30, 2017 USD ($) ft² | Apr. 30, 2016 USD ($) | Apr. 30, 2015 USD ($) | Sep. 30, 2021 USD ($)
Operating Leases, Rent Expense |  |  | $ 1,677,000 | $ 1,268,000 | $ 1,268,000 |
Additional Short Term Overlapping Rent Expense |  |  | $ 86,000 |  |  |
Sublease to American Building Maintenance Industries, Incorporated [Member] |  |  |  |  |  |
Annual Rental Expenditure, Initial, Decrease, Percentage | 23.00% |  |  |  |  |
Lessee Leasing Arrangements, Allowance | $ 417,000 |  |  |  |  |
Area of Real Estate Property | ft² | 24,726 |  |  |  |  |
Operating Leases, Annual Base Rent | $ 1,126,000 |  |  |  |  |
Base Rent Increase, Percent | 2.25% |  |  |  |  |
Security Deposit | $ 469,000 |  |  |  |  |
Sublease to American Building Maintenance Industries, Incorporated [Member] | Scenario, 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 |  |  |  |
Base Rent Increase Amount |  | 237,218 |  |  |  |
Security Deposit |  | $ 32,146 |  |  |  |
Citibank, N.A. (The "Sublandlord") [Member] |  |  |  |  |  |
Operating Lease Future Minimum Sublease Rental |  |  | $ 105,000 |  |  |

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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 No definition available. + Details
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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://www.xbrl.org/2003/role/presentationRef -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 + Details
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