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Note 12 - Lease Commitments (Details Textual) |  |  | 6 Months Ended |
--- | --- | --- | --- | ---
Nov. 30, 2016 USD ($) ft² | Feb. 29, 2016 USD ($) ft² | Oct. 31, 2017 USD ($) | Oct. 31, 2016 USD ($) | Sep. 30, 2021 USD ($)
Operating Leases, Rent Expense |  |  | $ 618,000 | $ 730,000 |
Sublease to American Building Maintenance Industries, Incorporated [Member] |  |  |  |  |
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 |  |  |  |
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] | 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 |  |  |
Security Deposit |  | 32,146 |  |  |
Base Rent Increase Amount |  | $ 237,218 |  |  |

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- Definition Area of a real estate property. + References No definition available. + Details
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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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