Note 5 - Income Taxes - Tax Reserves (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Taxes	$ 46	$ 42	$ 13
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	17	16
Unrecognized Tax Benefits, Income Tax Penalties Accrued	14	$ 13
Total Tax Liability	77
State and Local Jurisdiction [Member]
Taxes	46
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	17
Unrecognized Tax Benefits, Income Tax Penalties Accrued	14
Total Tax Liability	77
Domestic Tax Authority [Member]
Taxes	0
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	0
Unrecognized Tax Benefits, Income Tax Penalties Accrued	0
Total Tax Liability	0
Foreign Tax Authority [Member]
Taxes	0
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	0
Unrecognized Tax Benefits, Income Tax Penalties Accrued	0
Total Tax Liability	$ 0