Note 11 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 275,000
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	$ 31,000	$ 157,000
Open Tax Year	2014 2015 2016 2017 2018 2019 2020
Domestic Tax Authority [Member]
Operating Loss Carryforwards, Total	$ 36,400,000
State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Total	$ 23,700,000