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Geographical Data (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Jun. 30, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]          
Total Net Sales [1] $ 21,112 $ 20,715 $ 42,286 $ 40,883  
Total Identifiable Assets 70,487   70,487   $ 70,862
Domestic [Member]          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenues [1] 20,451 20,100 41,103 39,593  
Foreign [Member]          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenues [1] 661 $ 615 1,183 $ 1,290  
United States [Member]          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Total Identifiable Assets 52,124   52,124   55,550
Dominican Republic [Member]          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Total Identifiable Assets [2] $ 18,363   $ 18,363   $ 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 (December 31, 2017 = $14,765, June 30, 2017 = $11,831) and long-lived assets (December 31, 2017 = $3,379, June 30, 2017 = $3,233) located at the Company's principal manufacturing facility in the Dominican Republic.