Note 2 - Significant Accounting Policies and Basis of Presentation (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2021	Dec. 31, 2020
Operating Lease, Weighted Average Discount Rate, Percent	14.50%		14.50%		14.50%
Capitalized Contract Cost, Net, Total	$ 0		$ 0			$ 65,000
Capitalized Contract Cost, Additions	0		0
Revenue, Contract Costs	121,000		366,000
Revenues, Total	$ 778,000	$ 2,471,000	$ 2,452,000	$ 3,999,000
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Two Customers [Member]
Concentration Risk, Percentage	53.00%	82.00%
Revenues, Total	$ 411,000	$ 2,037,000
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Two Customer Two [Member]
Concentration Risk, Percentage			44.00%	65.00%
Revenues, Total			$ 1,078,000	$ 2,588,000
Accounts Receivable, after Allowance for Credit Loss, Total	223,000	193,000	223,000	193,000
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Two Customers [Member]
Accounts Receivable, after Allowance for Credit Loss, Total	$ 93,000	$ 193,000	$ 93,000	$ 193,000