Note D - Accumulated Other Comprehensive (Loss) Income (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Revenue, Net	$ 30,559,000	$ 26,911,000	$ 64,626,000	$ 48,496,000
Other Nonoperating Income (Expense)	(8,000)	(2,000)	(15,000)	(10,000)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member]
Revenue, Net	213,000	45,000	271,000	7,000
Other Nonoperating Income (Expense)	$ 130,000	$ 24,000	$ 230,000	$ 51,000