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Note 11 - Concentrations (Details Textual)	12 Months Ended
Note 11 - Concentrations (Details Textual)	Dec. 31, 2017	Dec. 31, 2016
Concentration Risk, Threshold Percentage	30.00%
Customer Concentration Risk [Member] \| Sales Revenue, Net [Member] \| U.S. Government [Member]
Concentration Risk, Percentage	81.60%	69.30%
Customer Concentration Risk [Member] \| Sales Revenue, Net [Member] \| Government Customers [Member]
Concentration Risk, Percentage	58.80%	49.70%
Number of Major Customers	3	3
Customer Concentration Risk [Member] \| Sales Revenue, Net [Member] \| Commercial Customers [Member]
Number of Major Customers	0	0
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Commercial Customers [Member]
Number of Major Customers	5	4