Note 10 - Income Taxes (Details Textual) - USD ($)		12 Months Ended
	Jan. 01, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount		$ 42,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%	21.00%	21.00%
Unrecognized Tax Benefits that Would Impact Effective Tax Rate		$ 5,100,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued		214,000	$ 72,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense		$ 142,000	$ (23,000)
Domestic Tax Authority [Member]
Open Tax Year		2020
State and Local Jurisdiction [Member]
Open Tax Year		2019