Note 5 - Operating Lease Right-of-use Asset, Net (Details Textual) - USD ($)	3 Months Ended				9 Months Ended
	Sep. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Operating Lease, Expense		$ 121,000	$ 150,000	$ 362,000		$ 451,000
Operating Lease, Payments	$ 114,000	$ 162,000		$ 486,000	$ 287,000
Operating Lease, Weighted Average Remaining Lease Term (Year)		4 years 4 months 2 days
Operating Lease, Weighted Average Discount Rate, Percent		10.74%