Note 7 - Concentrations (Details Textual)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019
Number of Areas in Which Operations are Concentrated			1
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | U.S. Government [Member]
Concentration Risk, Percentage	90.90%	84.50%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Three Government Customers [Member]
Concentration Risk, Percentage	75.80%
Number of Major Customers	3
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Four Government Customers [Member]
Concentration Risk, Percentage		66.40%
Number of Major Customers		4
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | One Commercial Customer [Member]
Concentration Risk, Percentage		14.50%
Number of Major Customers		1