Note N - Segment Information (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Number of Reportable Segments	2
Revenue from Contract with Customer, Including Assessed Tax	$ 178,520	$ 118,876
Non-US [Member]
Revenue from Contract with Customer, Including Assessed Tax	83,818	51,964
UNITED STATES
Revenue from Contract with Customer, Including Assessed Tax	$ 94,702	$ 66,912
Products Manufactured by NAIE [Member] | Non-US [Member] | Product Concentration Risk [Member] | Revenue Benchmark [Member]
Concentration Risk, Percentage	77.00%	89.00%
Products Manufactured by NAIE [Member] | UNITED STATES
Revenue from Contract with Customer, Including Assessed Tax	$ 0	$ 0