Note 15 - Litigation (Details) - USD ($)	1 Months Ended			9 Months Ended
	Jan. 31, 2018	Oct. 31, 2017	Mar. 31, 2017	Dec. 31, 2017
Note 15 - Litigation (Details) [Line Items]
Loss Contingency, Damages Sought, Value				$ 2,800,000
Aeroflex [Member]
Note 15 - Litigation (Details) [Line Items]
Loss Contingency, Damages Awarded, Value		$ 2,100,000	$ 2,800,000
Loss Contingency, Estimate of Possible Loss		$ 4,900,000
Business Opportunity [Member] | Aeroflex [Member]
Note 15 - Litigation (Details) [Line Items]
Loss Contingency, Damages Awarded, Value			1,300,000
Non-Disclosure Agreements [Member] | Aeroflex [Member]
Note 15 - Litigation (Details) [Line Items]
Loss Contingency, Damages Awarded, Value			525,000
Loss Contingency, Damages Sought, Value			1,500,000
Maximum [Member] | Aeroflex [Member]
Note 15 - Litigation (Details) [Line Items]
Loss Contingency, Damages Sought, Value			$ 5,000,000
Subsequent Event [Member] | Aeroflex [Member]
Note 15 - Litigation (Details) [Line Items]
Loss Contingency, Description	The Company has filed motions in January 2018 for the Court to reconsider the amount of damages on the grounds that they are duplicative and not legally supportable. A hearing on this motion is expected within the next 30 days and a final decision is expected within the next two to three months. The Judge could deny our motions, reduce the amount of damages or even order a new trial. Once a final decision has been rendered, the Company has 30 days to file an appeal. The Company has posted a $2,000,000 bond to prevent Aeroflex from enforcement actions until a final decision has been rendered by the Court. This $2 million bond amount would remain in place during the appeal process (See Note 5). The Company believes it has excellent grounds to appeal this verdict. The appeal process would be expected to take several years to complete.