Nature of Business and Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Significant Accounting Policies [Line Items]
Short-term time deposits	$ 460,000	$ 460,000
Intangible assets amortization expense	313,000	$ 371,000
Estimated amortization expense-2020	264,000
Estimated amortization expense-2021	223,000
Estimated amortization expense-2022	188,000
Estimated amortization expense-2023	159,000
Estimated amortization expense-2024	$ 134,000
Weighted average amortization period for acquired intangible assets	9 years 1 month 6 days	10 years 1 month 6 days
Research and development costs	$ 7,212,000	$ 6,630,000
Antidilutive options outstanding excluded from diluted EPS computations	2,957	217
Stock-based compensation costs	$ 160,000	$ 146,000
Stock-based compensation costs, effect on EPS	$ 0.01	$ 0.01
Cost of Goods and Services Sold	$ 59,042,000	$ 53,751,000
Selling, General and Administrative Expenses [Member]
Significant Accounting Policies [Line Items]
Advertising and promotion costs	2,047,000	2,011,000
Sales revenue, net [Member] | Shipping and Handling [Member]
Significant Accounting Policies [Line Items]
Cost of Goods and Services Sold	1,115,000	988,000
Cost of sales [Member]
Significant Accounting Policies [Line Items]
Research and development costs	7,212,000	6,630,000
Cost of sales [Member] | Shipping and Handling [Member]
Significant Accounting Policies [Line Items]
Cost of Goods and Services Sold	430,000	476,000
Allowance for doubtful accounts current [Member]
Significant Accounting Policies [Line Items]
Valuation allowances and reserves, balance	$ 88,000
Returns and other allowances [Member]
Significant Accounting Policies [Line Items]
Valuation allowances and reserves, balance		$ 195,000