Geographical Data (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Net Sales		$ 24,829	$ 21,112	$ 48,205	$ 42,286
Total Identifiable Assets		78,301		78,301		$ 73,269
Domestic [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Net Sales	[1]	24,013	20,451	46,886	41,103
Foreign [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Net Sales	[1]	816	$ 661	1,319	$ 1,183
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Identifiable Assets		53,600		53,600		52,928
Dominican Republic [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Identifiable Assets	[2]	$ 24,701		$ 24,701		$ 20,341

[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 (December 31, 2018 = $20,948, June 30, 2018 = $16,592) and long-lived assets (December 31, 2018 = $3,522, June 30, 2018 = $3,462) located at the Company's principal manufacturing facility in the Dominican Republic.