Note H - Segment Information - Net Sales by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Net sales	$ 25,482	$ 35,455	$ 83,780	$ 108,030
UNITED STATES
Net sales	12,908	16,222	48,682	52,417
Non-US [Member]
Net sales	$ 12,574	$ 19,233	$ 35,098	$ 55,613