Note H - Segment Information (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Number of Reportable Segments	2
Revenue from Contract with Customer, Including Assessed Tax	$ 29,103	$ 36,043	$ 58,298	$ 72,575
Non-US [Member]
Revenue from Contract with Customer, Including Assessed Tax	11,512	17,494	22,522	36,380
UNITED STATES
Revenue from Contract with Customer, Including Assessed Tax	$ 17,591	$ 18,549	$ 35,776	$ 36,195
Products Manufactured by NAIE [Member] | Non-US [Member] | Revenue Benchmark [Member] | Product Concentration Risk [Member]
Concentration Risk, Percentage	91.00%	90.00%	90.00%	80.00%
Products Manufactured by NAIE [Member] | UNITED STATES
Revenue from Contract with Customer, Including Assessed Tax	$ 0	$ 0	$ 0	$ 0