Note 9 - Income Taxes (Details Textual) - USD ($) Pure in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 215,000
Deferred Tax Assets, Valuation Allowance	7,600,000
Operating Loss Carryforwards	33,500,000
Income Taxes Paid, Net	0	$ 0
Deferred Tax Assets, Net of Valuation Allowance	$ 0
Effective Income Tax Rate Reconciliation, Percent	0.00%	0.00%