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Note G - Segment Information (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Number of Reportable Segments	2
Revenues, Total	$ 36,532	$ 28,074
Non-US [Member]
Revenues, Total	18,886	12,880
UNITED STATES
Revenues, Total	$ 17,646	$ 15,194
Products Manufactured by NAIE [Member] | Non-US [Member] | Sales Revenue, Net [Member] | Product Concentration Risk [Member]
Concentration Risk, Percentage	72.00%	75.00%
Products Manufactured by NAIE [Member] | UNITED STATES
Revenues, Total	$ 0	$ 0

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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