Quarterly report pursuant to Section 13 or 15(d)

Note 2 - Risks and Uncertainties (Details Textual)

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Note 2 - Risks and Uncertainties (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Retained Earnings (Accumulated Deficit), Total $ (89,367)       $ (89,367)   $ (82,501)
Net Income (Loss) Attributable to Parent, Total (3,358) $ (3,508) $ (3,274) $ (3,622) (6,866) $ (6,896)  
Net Cash Provided by (Used in) Operating Activities, Total         (6,384) $ (6,402)  
Cash, Cash Equivalents, and Short-Term Investments, Total 38,400       38,400    
Working Capital $ 37,600       $ 37,600