Note 10 - Concentrations (Details Textual) - Customer Concentration Risk [Member]	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Revenue Benchmark [Member] | U.S. Government [Member]
Concentration Risk, Percentage	87.40%	83.90%
Revenue Benchmark [Member] | Three Government Customers [Member]
Concentration Risk, Percentage	68.10%
Number of Major Customers	3
Revenue Benchmark [Member] | Four Government Customers [Member]
Concentration Risk, Percentage		61.40%
Number of Major Customers		4
Revenue Benchmark [Member] | One Commercial Customer [Member]
Concentration Risk, Percentage	10.40%	14.10%
Number of Major Customers	1	1
Accounts Receivable [Member] | Three Government Customers [Member]
Concentration Risk, Percentage	78.80%
Number of Major Customers	3
Accounts Receivable [Member] | Four Government Customers [Member]
Concentration Risk, Percentage		48.90%
Number of Major Customers		4
Accounts Receivable [Member] | One Commercial Customer [Member]
Number of Major Customers	1	1