Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.2
Note 3 - Revenue From Contracts With Customers (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 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   $ 0    
Revenue from Contract with Customer, Including Assessed Tax 16,000 $ 264,000 30,000 $ 265,000  
Contract with Customer, Asset, Impairment Loss 0 0 0 0  
Contract with Customer, Performance Obligation Satisfied in Previous Period 0 $ 0 0 $ 0  
Capitalized Contract Cost, Net, Total 0   0    
Contract with Customer, Asset, after Allowance for Credit Loss, Total $ 0   $ 0   $ 12,000
INDIA          
Contract with Customer, Term of Contract     8 years    
CHINA          
Contract with Customer, Term of Contract     10 years