Quarterly report pursuant to Section 13 or 15(d)

Note 10 - Related Party Transactions (Details Textual)

v3.21.2
Note 10 - Related Party Transactions (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Director [Member]        
Common Stock, Percentage of Beneficial Stock Outstanding 5.00%   5.00%  
BHS [Member] | Royalty Agreement and License [Member]        
Royalty Expense $ 11,000 $ 35,000 $ 19,000 $ 50,000
Related Party Transaction, Automatic Renewal Period of Agreement (Year)       1 year
Number of Days Termination Notice (Day)       90 days