Quarterly report pursuant to Section 13 or 15(d)

Note 10 - Leases (Details Textual)

v3.20.4
Note 10 - Leases (Details Textual)
3 Months Ended
Dec. 31, 2020
USD ($)
ft²
Dec. 31, 2019
USD ($)
Oct. 09, 2020
ft²
Feb. 12, 2020
ft²
Aug. 01, 2017
Jan. 01, 2015
Operating Lease, Weighted Average Remaining Lease Term (Year) 3 years 204 days 4 years 343 days        
Operating Lease, Weighted Average Discount Rate, Percent 3.40% 3.51%        
Operating Lease, Payments | $ $ 239,735 $ 167,840        
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 62 days
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)       3 years 180 days    
Lessee, Operating Lease, Number of Options to Renew       2    
Lessee, Operating Lease, Renewal Term (Year)       3 years