Note 5 - Concentrations (Details Textual) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Accounts Payable and Accrued Liabilities, Current, Total	$ 2,006,000		$ 2,006,000		$ 2,525,000
Supplier Concentration Risk [Member] | Two Vendors [Member] | Purchases [Member]
Concentration Risk, Percentage	86.00%		80.00%
Supplier Concentration Risk [Member] | Four Vendors [Member] | Purchases [Member]
Concentration Risk, Percentage		91.00%
Supplier Concentration Risk [Member] | Five Vendors [Member]
Accounts Payable and Accrued Liabilities, Current, Total	$ 131,000		$ 131,000		$ 270,000
Supplier Concentration Risk [Member] | Five Vendors [Member] | Purchases [Member]
Concentration Risk, Percentage				83.00%
Customer Concentration Risk [Member] | Two Customers [Member] | Accounts Receivable [Member]
Concentration Risk, Percentage			27.00%	27.00%
Customer Concentration Risk [Member] | Customer A [Member] | Accounts Receivable [Member]
Concentration Risk, Percentage			14.00%		17.00%
Accounts Receivable, after Allowance for Credit Loss, Total	147,700		$ 147,700		$ 210,000
Customer Concentration Risk [Member] | Customer C [Member] | Accounts Receivable [Member]
Concentration Risk, Percentage			13.00%		0.00%
Accounts Receivable, after Allowance for Credit Loss, Total	$ 137,700		$ 137,700
Customer Concentration Risk [Member] | Customer B [Member] | Accounts Receivable [Member]
Concentration Risk, Percentage			0.00%		10.00%
Accounts Receivable, after Allowance for Credit Loss, Total					$ 127,000