Note 14 - Major Customers and Related Information (Details Textual) - Customer Concentration Risk [Member]	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Revenue Benchmark [Member]
Number of Major Customers	2		2	3
Revenue Benchmark [Member] | Distributor One [Member]
Concentration Risk, Percentage	41.00%	49.00%	27.00%	39.00%
Revenue Benchmark [Member] | Distributor Two [Member]
Concentration Risk, Percentage	29.00%		21.00%	12.00%
Revenue Benchmark [Member] | Agencies [Member]
Number of Major Customers		1
Revenue Benchmark [Member] | Distributor Three [Member]
Concentration Risk, Percentage				11.00%
Accounts Receivable [Member]
Number of Major Customers			2		2
Accounts Receivable [Member] | Distributor One [Member]
Concentration Risk, Percentage			45.00%		28.00%
Accounts Receivable [Member] | Distributor Two [Member]
Concentration Risk, Percentage			22.00%		26.00%