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Note 12 - Lease Commitments (Details Textual)
3 Months Ended
Nov. 30, 2016
USD ($)
ft²
Feb. 29, 2016
USD ($)
ft²
Jul. 31, 2017
USD ($)
Jul. 31, 2016
USD ($)
Sep. 30, 2021
USD ($)
Operating Leases, Rent Expense     $ 309,000 $ 365,000  
Sublease to American Building Maintenance Industries, Incorporated [Member]          
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        
Area of Real Estate Property | ft² 24,726        
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]          
Operating Leases, Annual Base Rent   $ 192,880      
Base Rent Increase Amount   237,218      
Security Deposit   $ 32,146      
Area of Real Estate Property | ft²   24,110