Annual report pursuant to Section 13 and 15(d)

Note 9 - Leases (Details Textual)

v3.22.2.2
Note 9 - Leases (Details Textual)
12 Months Ended
Jul. 31, 2021
USD ($)
ft²
Sep. 30, 2022
USD ($)
ft²
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Nov. 19, 2021
ft²
Jan. 01, 2015
Operating Lease, Weighted Average Remaining Lease Term (Year)   4 years 14 days 3 years 1 month 2 days      
Operating Lease, Weighted Average Discount Rate, Percent   3.22% 3.41%      
Operating Lease, Payments | $   $ 2,064,000 $ 1,290,000 $ 812,000    
7050 Winnetka Avenue North, Brooklyn Park, Minnesota [Member]            
Area of Real Estate Property (Square Foot)   85,000        
Lessee, Operating Lease, Term of Contract (Year)           10 years 2 months 1 day
Tijuana, Mexico 3 [Member]            
Area of Real Estate Property (Square Foot) 318,000          
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract (Year) 7 years          
Lessee, Operating Lease, Number of Options to Renew 2          
Lessee, Operating Lease, Lease Not yet Commenced, Renewal Term (Year) 5 years       5 years  
Operating Lease, Monthly Payment | $ $ 162,000          
Operating Lease, Payments, Increase, Percentage 2.00%          
Tijuana, Mexico 3 [Member] | Lease Mandatory Contractual Term [Member]            
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract (Year) 5 years          
Brooklyn Part, MN [Member]            
Area of Real Estate Property (Square Foot)         105,000  
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract (Year)         5 years  
Oulu, Finland [Member]            
Area of Real Estate Property (Square Foot)   25,000        
Operating Lease, Monthly Payment | $   $ 40,000