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 ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Income Tax Expense (Benefit), Total $ (0) $ (229,000) $ 0 $ (229,000)
Effective Income Tax Rate Reconciliation, Percent, Total 0.00% 5.20% 0.00% 1.40%
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount     $ 0