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Note 9 - Operating Leases (Details Textual)
Mar. 31, 2020
Jul. 31, 2019
Shenzhen Facility [Member]    
Lessee, Operating Lease, Term of Contract (Year)   5 years
Minimum [Member]    
Operating Lease, Remaining Lease Term (Year) 1 year  
Maximum [Member]    
Operating Lease, Remaining Lease Term (Year) 4 years