Quarterly report pursuant to Section 13 or 15(d)

Note 12 - Leases (Details Textual)

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Note 12 - Leases (Details Textual)
3 Months Ended 6 Months Ended
Oct. 28, 2021
USD ($)
Jul. 31, 2021
USD ($)
ft²
Mar. 31, 2022
USD ($)
ft²
Mar. 31, 2021
USD ($)
Mar. 31, 2022
USD ($)
ft²
Mar. 31, 2021
USD ($)
Nov. 19, 2021
ft²
Oct. 09, 2020
ft²
Feb. 12, 2020
ft²
Operating Lease, Weighted Average Remaining Lease Term (Year)     4 years 8 months 15 days 3 years 3 months 29 days 4 years 8 months 15 days 3 years 3 months 29 days      
Operating Lease, Weighted Average Discount Rate, Percent     3.05% 3.40% 3.05% 3.40%      
Operating Lease, Payments | $     $ 238,000 $ 240,000 $ 550,000 $ 480,000      
7050 Winnetka Avenue North, Brooklyn Park, Minnesota [Member]                  
Area of Real Estate Property (Square Foot)     85,000   85,000        
Lessee, Operating Lease, Term of Contract (Year)     10 years 2 months 1 day   10 years 2 months 1 day        
Tijuana, Mexico [Member]                  
Area of Real Estate Property (Square Foot)               46,000  
Tijuana, Mexico 2 [Member]                  
Area of Real Estate Property (Square Foot)                 52,000
Operating Lease Termination Fee | $ $ 92,000                
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              
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    
Lessee, Operating Lease, Number of Options to Renew             5