Nature of Business and Summary of Significant Accounting Policies (Narrative) (Detail) - USD ($)	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Significant Accounting Policies [Line Items]
Carrying amount of long-term debt, including current portion	$ 4,800,000	$ 10,700,000
Short-term time deposits	460,000	460,000
Intangible assets amortization expense	529,000	$ 667,000
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	12 years 1 month 6 days	13 years 1 month 6 days
Antidilutive options outstanding excluded from diluted EPS computations	127,404	255,688
Stock-based compensation costs	$ 103,000	$ 101,000
Sales Returns And Allowances Percentage	7.00%	8.00%
Stock-based compensation costs, effect on EPS	$ 0.01	$ 0.01
Selling, General and Administrative Expenses [Member]
Significant Accounting Policies [Line Items]
Advertising and promotion costs	$ 2,132,000	$ 1,671,000
Sales revenue, net [Member]
Significant Accounting Policies [Line Items]
Shipping and handling revenue	918,000	945,000
Cost of sales [Member]
Significant Accounting Policies [Line Items]
Research and development costs	6,169,000	5,382,000
Shipping and handling expense	492,000	515,000
Allowance for doubtful accounts current [Member]
Significant Accounting Policies [Line Items]
Valuation allowances and reserves, balance	145,000	175,000
Returns and other allowances [Member]
Significant Accounting Policies [Line Items]
Valuation allowances and reserves, balance	$ 1,255,000	$ 1,260,000