Quarterly report pursuant to Section 13 or 15(d)

Note 10 - Leases (Details Textual)

v3.21.2
Note 10 - Leases (Details Textual)
3 Months Ended 9 Months Ended
Jun. 30, 2021
USD ($)
ft²
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
ft²
Jun. 30, 2020
USD ($)
Oct. 09, 2020
ft²
Feb. 12, 2020
ft²
Aug. 01, 2017
Jan. 01, 2015
Operating Lease, Weighted Average Remaining Lease Term (Year) 3 years 1 month 2 days 4 years 2 months 15 days 3 years 1 month 2 days 4 years 2 months 15 days        
Operating Lease, Weighted Average Discount Rate, Percent 3.41% 3.48% 3.41% 3.48%        
Operating Lease, Payments | $ $ 242,736 $ 237,726 $ 722,537 $ 574,381        
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
Operating Lease Termination Fee | $     $ 249,000          
Tijuana, Mexico [Member]                
Area of Real Estate Property (Square Foot)         46,000      
Lessee, Operating Lease, Term of Contract (Year)         3 years   3 years  
Tijuana, Mexico 2 [Member]                
Area of Real Estate Property (Square Foot)           52,000    
Lessee, Operating Lease, Term of Contract (Year)           42 months    
Lessee, Operating Lease, Number of Options to Renew           2    
Lessee, Operating Lease, Renewal Term (Year)           3 years