Note 9 - Leases - Lease Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Right-of-use operating lease assets, net	$ 571,000	$ 730,000
Non-current lease liability	$ 398,000	$ 604,000
Weighted average remaining lease term (Year)	2 years 4 months 24 days	3 years 4 months 24 days
Discount rate	22.00%	22.00%
Operating lease cost	$ 311,000	$ 311,000
Variable lease cost	105,000	139,000
Total lease cost	416,000	450,000
Current Liabilities [Member]
Current lease liability (included in other current liabilities)	$ 206,000	$ 157,000