Note H - Segment Information (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Number of Reportable Segments			2
Revenue from Contract with Customer, Including Assessed Tax	$ 48,083	$ 29,103	$ 87,809	$ 58,298
Non-US [Member]
Revenue from Contract with Customer, Including Assessed Tax	25,009	11,512	44,949	22,522
UNITED STATES
Revenue from Contract with Customer, Including Assessed Tax	$ 23,074	$ 17,591	$ 42,860	$ 35,776
Products Manufactured by NAIE [Member] | Non-US [Member] | Product Concentration Risk [Member] | Revenue Benchmark [Member]
Concentration Risk, Percentage	83.00%	91.00%	85.00%	90.00%
Products Manufactured by NAIE [Member] | UNITED STATES
Revenue from Contract with Customer, Including Assessed Tax	$ 0	$ 0	$ 0	$ 0