Nature of Business and Summary of Significant Accounting Policies (Narrative) (Detail) - USD ($)	3 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Jun. 30, 2016
Significant Accounting Policies [Line Items]
Carrying amount of long-term debt, including current portion	$ 3,925,000
Short-term time deposits	460,000		$ 460,000
Intangible assets amortization expense	110,000	$ 137,000
Estimated amortization expense-2017	441,000
Estimated amortization expense-2018	371,000
Estimated amortization expense-2019	313,000
Estimated amortization expense-2020	264,000
Estimated amortization expense-2021	$ 223,000
Weighted average amortization period for acquired intangible assets	11 years 10 months 24 days	12 years 10 months 24 days
Antidilutive options outstanding excluded from diluted EPS computations	0	170,000
Stock-based compensation costs	$ 33,000	$ 32,000
Sales Returns And Allowances Percentage	9.00%	7.00%
Stock-based compensation costs, effect on EPS	$ 0.00	$ 0.00
Selling, General and Administrative Expenses [Member]
Significant Accounting Policies [Line Items]
Advertising and promotion costs	$ 674,000	$ 558,000
Sales revenue, net [Member]
Significant Accounting Policies [Line Items]
Shipping and handling revenue	216,000
Cost of sales [Member]
Significant Accounting Policies [Line Items]
Research and development costs	1,628,000	1,489,000
Shipping and handling expense	139,000	$ 131,000
Allowance for doubtful accounts current [Member]
Significant Accounting Policies [Line Items]
Valuation allowances and reserves, balance	140,000		145,000
Returns and other allowances [Member]
Significant Accounting Policies [Line Items]
Valuation allowances and reserves, balance	$ 1,186,000		$ 1,255,000