Note G - Segment Information (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Number of Reportable Segments			2
Revenues, Total	$ 31,815	$ 25,135	$ 93,224	$ 89,761
Non-US [Member]
Revenues, Total	14,580	10,530	44,369	46,277
UNITED STATES
Revenues, Total	17,235	14,605	48,855	43,484
Products Manufactured by NAIE [Member] | UNITED STATES
Revenues, Total	$ 0	$ 0	$ 0	$ 0
Product Concentration Risk [Member] | Products Manufactured by NAIE [Member] | Non-US [Member]
Concentration Risk, Percentage	89.00%	62.00%	82.00%	55.00%