Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.1
Note 3 - Revenue From Contracts With Customers (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Contract with Customer, Payment Term, Minimum 15 days    
Contract with Customer, Payment Term, Maximum 90 days    
Contract with Customer, Transaction Price of Royalties Using Expected Value Method $ 0    
Revenue from Contract with Customer, Including Assessed Tax 14,000 $ 16,000  
Contract with Customer, Asset, Impairment Loss 0 $ 0  
Capitalized Contract Cost, Net, Total 0    
Contract with Customer, Asset, after Allowance for Credit Loss, Total $ 1,000   $ 12,000
INDIA      
Contract with Customer, Term of Contract 8 years    
CHINA      
Contract with Customer, Term of Contract 10 years