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Nature of Business and Summary of Significant Accounting Policies (Narrative) (Detail) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2018
Significant Accounting Policies [Line Items] |  |  |  |  |
Short-term time deposits | $ 460,000 |  | $ 460,000 |  | $ 460,000
Intangible assets amortization expense | 79,000 | $ 92,000 | 157,000 | $ 185,000 |
Estimated amortization expense-2019 | 313,000 |  | 313,000 |  |
Estimated amortization expense-2020 | 264,000 |  | 264,000 |  |
Estimated amortization expense-2021 | 223,000 |  | 223,000 |  |
Estimated amortization expense-2022 | 188,000 |  | 188,000 |  |
Estimated amortization expense-2023 | 159,000 |  | $ 159,000 |  |
Weighted average amortization period for acquired intangible assets |  |  | 9 years 7 months 6 days | 10 years 7 months 6 days |
Research and development costs | $ 1,762,000 | $ 1,639,000 | $ 3,507,000 | $ 3,246,000 |
Antidilutive options outstanding excluded from diluted EPS computations | 11,826 | 870 | 5,913 | 435 |
Stock-based compensation costs | $ 147,000 | $ 103,000 | $ 152,000 | $ 136,000 |
Cost of Goods and Services Sold | 14,158,000 | 12,633,000 | 27,975,000 | 25,321,000 |
Selling, General and Administrative Expenses [Member] |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Advertising and promotion costs | 435,000 | 462,000 | 1,085,000 | 1,103,000 |
Sales revenue, net [Member] | Shipping and Handling [Member] |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Cost of Goods and Services Sold | 265,000 | 252,000 | 547,000 | 459,000 |
Cost of sales [Member] |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Research and development costs | 1,762,000 | 1,639,000 | 3,507,000 | 3,246,000 |
Cost of sales [Member] | Shipping and Handling [Member] |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Cost of Goods and Services Sold | 103,000 | $ 125,000 | 204,000 | $ 247,000 |
Allowance for doubtful accounts current [Member] |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Valuation allowances and reserves, balance | $ 182,000 |  | $ 182,000 |  | $ 195,000

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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://fasb.org/us-gaap/role/ref/legacyRef -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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