Note 8 - Lease (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Operating Lease, Right-of-Use Asset, Amortization Expense	$ 26,000	$ 21,000	$ 75,000	$ 67,000
Operating Lease, Expense	$ 30,000	$ 23,000	$ 88,000	73,000
Operating Lease, Weighted Average Remaining Lease Term	2 years 9 months 29 days		2 years 9 months 29 days
Operating Lease, Weighted Average Discount Rate, Percent	5.00%		5.00%
Short-Term Lease, Cost			$ 3	$ 0