Quarterly report pursuant to Section 13 or 15(d)

Note 14 - Related Party Transactions (Details Textual)

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Note 14 - Related Party Transactions (Details Textual) - Stellartech Research Corporation [Member] - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Stock Issued During Period, Shares, New Issues (in shares)     38    
Related Party Transaction, Amounts of Transaction $ 77,000 $ 467,000 $ 154,000 $ 749,000  
Due to Related Parties, Total $ 35,000   $ 35,000   $ 9,000