Note 20 - Concentration of Credit Risk and Major Customers (Details Textual)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Geographic Concentration Risk [Member] | Revenue Benchmark [Member] | UNITED STATES
Concentration Risk, Percentage	54.00%	65.00%	65.00%
Exporters Concentration Risk [Member] | Revenue Benchmark [Member] | Non-US [Member]
Concentration Risk, Percentage	46.00%	35.00%	35.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member]
Number of Major Customers	3	3	3
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Three Customers [Member]
Concentration Risk, Percentage	40.00%	55.00%	70.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member]
Number of Major Customers	3	3