Note 9 - Lease (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Operating Lease, Right-of-Use Asset, Amortization Expense	$ 101,000	$ 88,000
Operating Lease, Expense	$ 118,000	95,000
Operating Lease, Weighted Average Remaining Lease Term	2 years 6 months 29 days
Operating Lease, Weighted Average Discount Rate, Percent	5.00%
Variable Lease, Cost	$ 39,000	29,000
Short-Term Lease, Cost	$ 11	$ 0