Geographical Data (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Jun. 30, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Net Sales	[1]	$ 22,200	$ 20,807	$ 64,486	$ 61,690
Total Identifiable Assets		70,210		70,210		$ 70,862
Domestic [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	[1]	21,659	20,059	62,762	59,652
Foreign [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	[1]	541	$ 748	1,724	$ 2,038
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Identifiable Assets		52,442		52,442		55,550
Dominican Republic [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Identifiable Assets	[2]	$ 17,768		$ 17,768		$ 15,312

[1] All of the Company's sales originate in the United States and are shipped primarily from the Company's facilities in the United States. There were no sales into any one foreign country in excess of 10% of total Net Sales.

[2] Consists primarily of inventories (March 31, 2018 = $13,967, June 30, 2017 = $11,831) and long-lived assets (March 31, 2018 = $3,518, June 30, 2017 = $3,233) located at the Company's principal manufacturing facility in the Dominican Republic.