Nature of Business and Summary of Significant Accounting Policies (Narrative) (Detail) (USD $)	3 Months Ended		9 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014	Jun. 30, 2014
Significant Accounting Policies [Line Items]
Carrying amount of long-term debt, including current portion	$ 10,600,000		$ 10,600,000		$ 11,800,000
Short-term time deposits	460,000		460,000		460,000
Intangible assets amortization expense	167,000	195,000	500,000	586,000
Estimated amortization expense-2015	667,000		667,000
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
Weighted average amortization period for acquired intangible assets			13 years 3 months 18 days	14 years 1 month 6 days
Antidilutive options outstanding excluded from diluted EPS computations	262,000	37,500	258,583	145,673
Stock-based compensation costs	0	10,000	101,000	17,000
Sales Returns And Allowances Percentage	8.00%	8.00%	8.00%	7.00%
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	172,000	189,000	1,028,000	801,000
Sales revenue, net [Member]
Significant Accounting Policies [Line Items]
Shipping and handling revenue	117,000	131,000	374,000	383,000
Cost of sales [Member]
Significant Accounting Policies [Line Items]
Research and development costs	1,350,000	1,275,000	3,995,000	3,813,000
Shipping and handling expense	211,000	241,000	692,000	704,000
Allowance for doubtful accounts current [Member]
Significant Accounting Policies [Line Items]
Valuation allowances and reserves, balance	175,000		175,000		180,000
Returns and other allowances [Member]
Significant Accounting Policies [Line Items]
Valuation allowances and reserves, balance	$ 1,010,000		$ 1,010,000		$ 1,005,000