Nature of Business and Summary of Significant Accounting Policies (Narrative) (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Jun. 30, 2015
Significant Accounting Policies [Line Items]
Carrying amount of long-term debt, including current portion	$ 7,900,000		$ 7,900,000
Short-term time deposits	460,000		460,000		$ 460,000
Intangible assets amortization expense	131,000	$ 167,000	268,000	$ 333,000
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 7 months 6 days	13 years 6 months
Antidilutive options outstanding excluded from diluted EPS computations	106,000	368,250	137,750	256,875
Stock-based compensation costs	$ 60,000	$ 67,000	$ 92,000	$ 101,000
Sales Returns And Allowances Percentage			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	$ 510,000	$ 312,000	$ 1,068,000	$ 856,000
Sales revenue, net [Member]
Significant Accounting Policies [Line Items]
Shipping and handling revenue	225,000	240,000	441,000	481,000
Cost of sales [Member]
Significant Accounting Policies [Line Items]
Research and development costs	1,519,000	1,335,000	3,008,000	2,653,000
Shipping and handling expense	125,000	$ 130,000	256,000	$ 257,000
Allowance for doubtful accounts current [Member]
Significant Accounting Policies [Line Items]
Valuation allowances and reserves, balance	90,000		90,000		175,000
Returns and other allowances [Member]
Significant Accounting Policies [Line Items]
Valuation allowances and reserves, balance	$ 995,000		$ 995,000		$ 1,260,000