Note H - Segment Information (Details Textual) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Number of Reportable Segments			2
Revenue from Contract with Customer, Including Assessed Tax	$ 37,727	$ 48,083	$ 76,067	$ 87,809
Non-US [Member]
Revenue from Contract with Customer, Including Assessed Tax	12,325	25,009	27,170	44,949
UNITED STATES
Revenue from Contract with Customer, Including Assessed Tax	25,402	23,074	48,897	42,860
Products Manufactured by NAIE [Member] | UNITED STATES
Revenue from Contract with Customer, Including Assessed Tax	$ 0	$ 0	$ 0	$ 0
Products Manufactured by NAIE [Member] | Revenue Benchmark [Member] | Product Concentration Risk [Member] | Non-US [Member]
Concentration Risk, Percentage	89.00%	83.00%	84.00%	85.00%