Quarterly report pursuant to Section 13 or 15(d)

Note 3 - Revenue From Contracts With Customers (Details Textual)

v3.20.1
Note 3 - Revenue From Contracts With Customers (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Contract with Customer, Payment Term, Minimum (Day) 15 days    
Contract with Customer, Payment Term, Maximum (Day) 90 days    
Contract with Customer, Transaction Price of Royalties Using Expected Value Method $ 0    
Revenue from Contract with Customer, Including Assessed Tax 15,000 $ 14,000  
Contract with Customer, Asset, Impairment Loss 0 $ 0  
Capitalized Contract Cost, Net, Total 0    
Contract with Customer, Asset, after Allowance for Credit Loss, Total $ 0   $ 0
INDIA      
Contract with Customer, Term of Contract (Year) 8 years    
CHINA      
Contract with Customer, Term of Contract (Year) 10 years