Quarterly report pursuant to Section 13 or 15(d)

Note 6 - Income Taxes (Details Textual)

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Note 6 - Income Taxes (Details Textual) - USD ($)
Pure in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2021
Jun. 30, 2020
Income Tax Expense (Benefit), Total $ 0   $ 0
Effective Income Tax Rate Reconciliation, Percent, Total   0.00% 0.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount   $ 0