Note 10 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ (884,000)	$ (206,000)
Deferred Tax Assets, Valuation Allowance, Percent		100.00%
Open Tax Year	2018 2019 2020
Domestic Tax Authority [Member]
Operating Loss Carryforwards, Total	$ 39,069,000
Operating Loss Carryforwards, Not Subject to Expiration	1,931,000
Operating Loss Carryforwards, Subject to Expiration	37,138,000
State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Total	13,995,000
Foreign Tax Authority [Member]
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total	$ 70,060	$ 0