Geographical Data (Detail) - USD ($) $ in Thousands		3 Months Ended																12 Months Ended
		Jun. 30, 2018		Mar. 31, 2018	[1]	Dec. 31, 2017	[1]	Sep. 30, 2017	[1]	Jun. 30, 2017		Mar. 31, 2017	[1]	Dec. 31, 2016	[1]	Sep. 30, 2016	[1]	Jun. 30, 2018		Jun. 30, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Net Sales		$ 27,260	[1]	$ 22,200		$ 21,112		$ 21,174		$ 25,684	[1]	$ 20,807		$ 20,715		$ 20,168		$ 91,746	[2]	$ 87,374	[2]
Total Identifiable Assets		73,269								70,862								73,269		70,862
Domestic [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Net Sales	[2]																	89,490		84,820
Foreign [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Net Sales	[2]																	2,256		2,554
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Identifiable Assets		52,928								55,550								52,928		55,550
Dominican Republic [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Identifiable Assets	[3]	$ 20,341								$ 15,312								$ 20,341		$ 15,312

[1] Certain prior period balances have been reclassified to conform with the current period presentation.

[2] 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.

[3] Consists primarily of inventories (2018 = $16,592; 2017 = $11,831) and fixed assets (2018 = $3,462; 2017 = $3,233) located at the Company's principal manufacturing facility in the Dominican Republic.