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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, 2021
USD ($)
Apr. 30, 2020
USD ($)
Apr. 30, 2019
USD ($)
Oct. 03, 2021
USD ($)
May 01, 2019
USD ($)
Oct. 30, 2016
USD ($)
Operating Lease, Right-of-Use Asset     $ 7,522,000 $ 8,550,000     $ 9,575,000  
Operating Lease, Liability, Total     8,455,000       10,340,000  
Lease Incentive Receivable             $ 765,000  
Operating Lease, Expense     1,499,000 $ 1,499,000 $ 1,278,000      
Operating Lease, Payments     $ 1,432,000          
Sublease to American Building Maintenance Industries, Incorporated [Member]                
Area of Real Estate Property (Square Foot) | 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] | Forecast [Member]                
Security Deposit           $ 305,000    
Seagis Property Group LP (the "Landlord") [Member] | Value Line Distribution Center ("VLDC") [Member]                
Area of Real Estate Property (Square Foot) | ft²   24,110            
Operating Leases, Annual Base Rent   $ 192,880            
Security Deposit   32,146            
Base Rent Increase Amount   $ 237,218