Note 14 - Concentrations - Accounts Receivables and Revenues (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Revenues	$ 9,294,000	$ 9,744,000
Customer 1 [Member]
Accounts receivable	206,000	531,000
Revenues	$ 2,180,000	$ 2,646,000
Customer 1 [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Accounts receivable, percent	13.00%	38.00%
Customer 1 [Member] | Revenue Benchmark [Member] | Customer Concentration Risk [Member]
Accounts receivable, percent	23.00%	27.00%
Customer 2 [Member]
Accounts receivable	$ 200,000	$ 337,000
Revenues	$ 1,373,000	$ 938,000
Customer 2 [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Accounts receivable, percent	13.00%	24.00%
Customer 2 [Member] | Revenue Benchmark [Member] | Customer Concentration Risk [Member]
Accounts receivable, percent	15.00%	10.00%
Customer 3 [Member]
Accounts receivable		$ 139,000
Revenues	$ 809,000	$ 1,293,000
Customer 3 [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]
Accounts receivable, percent		10.00%
Customer 3 [Member] | Revenue Benchmark [Member] | Customer Concentration Risk [Member]
Accounts receivable, percent	9.00%	13.00%