Note 5 - Related Party Lease (Details Textual) - Lease Agreement with Z3 Investment LLC [Member]		6 Months Ended
	Mar. 24, 2022 USD ($) ft²	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)
Area of Real Estate Property | ft²	35,000
Second Six Months, Rental Expense, Operating Lease	$ 104,000
Percent Increase, Annual Rental Expense	4.00%
Operating lease, Operating Expenses, Per Month	$ 10,000
Operating Lease, Payments		$ 622,000	$ 138,000