Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.2
Note 3 - Revenue From Contracts With Customers (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 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 $ 9,000   $ 16,000   $ 24,000 $ 30,000  
Contract with Customer, Asset, Impairment Loss   $ 0   $ 0 0 $ 0  
Capitalized Contract Cost, Net, Total 0       0    
Contract with Customer, Asset, after Allowance for Credit Loss, Total $ 0       $ 0   $ 0
INDIA              
Contract with Customer, Term of Contract (Year)   8 years          
CHINA              
Contract with Customer, Term of Contract (Year)   10 years