Note 11 - Income Taxes (Details Textual) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($)
Domestic Tax Authority [Member]
Operating Loss Carryforwards	$ 54.4
Operating Loss Carryforwards, Subject To Expiration	$ 9.9
Domestic Tax Authority [Member] | Minimum [Member]
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2023
Domestic Tax Authority [Member] | Maximum [Member]
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2037
State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Subject To Expiration	$ 46.0
State and Local Jurisdiction [Member] | Minimum [Member]
Operating Loss Carryforwards, Expiration Date	Jan. 01, 2023
State and Local Jurisdiction [Member] | Maximum [Member]
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2042