Nature of Business and Summary of Significant Accounting Policies (Narrative) (Detail) - USD ($)	12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Significant Accounting Policies [Line Items]
Carrying amount of long-term debt, including current portion	$ 10,700,000	$ 11,800,000
Short-term time deposits	460,000	460,000
Intangible assets amortization expense	667,000	$ 782,000
Estimated amortization expense-2016	529,000
Estimated amortization expense-2017	441,000
Estimated amortization expense-2018	371,000
Estimated amortization expense-2019	313,000
Estimated amortization expense-2020	$ 264,000
Weighted average amortization period for acquired intangible assets	13 years 1 month 6 days	13 years 10 months 24 days
Antidilutive options outstanding excluded from diluted EPS computations	255,688	145,673
Stock-based compensation costs	$ 101,000	$ 76,000
Sales Returns And Allowances Percentage	8.00%	8.00%
Stock-based compensation costs, effect on EPS	$ 0.01	$ 0.00
Selling, General and Administrative Expenses [Member]
Significant Accounting Policies [Line Items]
Advertising and promotion costs	$ 1,671,000	$ 1,408,000
Sales revenue, net [Member]
Significant Accounting Policies [Line Items]
Shipping and handling revenue	945,000	985,000
Cost of sales [Member]
Significant Accounting Policies [Line Items]
Research and development costs	5,382,000	5,059,000
Shipping and handling expense	515,000	531,000
Allowance for doubtful accounts current [Member]
Significant Accounting Policies [Line Items]
Valuation allowances and reserves, balance	175,000	180,000
Returns and other allowances [Member]
Significant Accounting Policies [Line Items]
Valuation allowances and reserves, balance	$ 1,260,000	$ 1,005,000