Nature of Business and Summary of Significant Accounting Policies (Narrative) (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015	Jun. 30, 2015
Significant Accounting Policies [Line Items]
Carrying amount of long-term debt, including current portion	$ 7,500,000		$ 7,500,000
Short-term time deposits	460,000		460,000
Intangible assets amortization expense	131,000	$ 167,000	398,000	$ 500,000
Estimated amortization expense-2016	529,000		529,000
Estimated amortization expense-2017	441,000		441,000
Estimated amortization expense-2018	371,000		371,000
Estimated amortization expense-2019	313,000		313,000
Estimated amortization expense-2020	$ 264,000		$ 264,000
Weighted average amortization period for acquired intangible assets			12 years 3 months 18 days	13 years 3 months 18 days
Antidilutive options outstanding excluded from diluted EPS computations	165,615	262,000	147,038	258,583
Stock-based compensation costs	$ 0	$ 0	$ 92,000	$ 101,000
Sales Returns And Allowances Percentage	6.00%	8.00%	7.00%	8.00%
Stock-based compensation costs, effect on EPS	$ 0.00	$ 0.00	$ 0.00	$ 0.00
Selling, General and Administrative Expenses [Member]
Significant Accounting Policies [Line Items]
Advertising and promotion costs	$ 259,000	$ 172,000	$ 1,328,000	$ 1,028,000
Sales revenue, net [Member]
Significant Accounting Policies [Line Items]
Shipping and handling revenue	232,000	211,000	673,000	692,000
Cost of sales [Member]
Significant Accounting Policies [Line Items]
Research and development costs	1,513,000	1,350,000	4,521,000	3,995,000
Shipping and handling expense	109,000	$ 117,000	365,000	$ 374,000
Allowance for doubtful accounts current [Member]
Significant Accounting Policies [Line Items]
Valuation allowances and reserves, balance	135,000		135,000		$ 175,000
Returns and other allowances [Member]
Significant Accounting Policies [Line Items]
Valuation allowances and reserves, balance	$ 975,000		$ 975,000		$ 1,260,000