Note 7 - Income Taxes - Change in Unrecognized Tax Benefits (Details) - USD ($) |
12 Months Ended | |
---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
|
Balance of unrecognized tax benefits | $ 768,000 | $ 592,000 |
Reductions due to lapse of applicable statute of limitations | (38,000) | (34,000) |
Reductions due to tax positions of prior years | 4,000 | |
Additions based on tax positions related to the current year | 345,000 | 206,000 |
Balance of unrecognized tax benefits | $ 1,075,000 | $ 768,000 |