Note 2 - Significant Accounting Policies and Basis of Presentation (Details Textual) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating Lease, Weighted Average Discount Rate, Percent	14.50%
Operating Lease, Impairment Loss	$ 0
Capitalized Contract Cost, Net, Total	0
Capitalized Contract Cost, Additions	0
Revenues, Total	$ 845,000	$ 733,000
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Two Customers [Member]
Concentration Risk, Percentage	37.00%	45.00%
Revenues, Total	$ 314,000	$ 333,000
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Two Customers [Member]
Accounts Receivable, after Allowance for Credit Loss, Total	$ 35,000	$ 249,000