Quarterly report pursuant to Section 13 or 15(d)

Note 5 - Leases (Details Textual)

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Note 5 - Leases (Details Textual)
3 Months Ended 6 Months Ended
Jun. 30, 2022
USD ($)
ft²
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
ft²
Jun. 30, 2021
USD ($)
Jun. 30, 2020
Operating Lease, Payments | $ $ 315,000 $ 344,000 $ 637,000 $ 702,000  
HONG KONG          
Area of Land (Square Foot) 7,300   7,300    
Rolling Hills Estates [Member]          
Area of Land (Square Foot) 4,900   4,900    
Lessee, Operating Lease, Renewal Term (Year)         5 years
Richmond, British Columbia [Member]          
Area of Land (Square Foot) 1,600   1,600    
Metuchen, New Jersey [Member]          
Area of Land (Square Foot) 2,000   2,000    
CHINA          
Lessee, Number of Branches 7   7