Annual report pursuant to Section 13 and 15(d)

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

v3.21.1
Note 3 - Revenue From Contracts With Customers (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2020
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 119,000 $ 38,000
Contract with Customer, Asset, Impairment Loss 0 0
Capitalized Contract Cost, Net, Total 0  
Contract with Customer, Asset, after Allowance for Credit Loss, Total 59,000 0
Grant [Member]    
Revenue Not from Contract with Customer $ 696,000 $ 611,000
INDIA    
Contract with Customer, Term of Contract (Year) 8 years  
CHINA    
Contract with Customer, Term of Contract (Year) 10 years