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Nature of Business and Summary of Significant Accounting Policies (Narrative) (Detail) - USD ($) | 12 Months Ended
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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

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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