Nature of Business and Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Jun. 30, 2019
Significant Accounting Policies [Line Items]
Short-term time deposits	$ 460,000		$ 460,000		$ 460,000
Intangible assets amortization expense	66,000	$ 79,000	132,000	$ 157,000
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
Estimated amortization expense- 2024	134,000		$ 134,000
Remaining weighted average amortization period for acquired intangible assets			8 years 7 months 6 days	9 years 7 months 6 days
Research and development costs	$ 1,823,000	$ 1,762,000	$ 3,572,000	$ 3,507,000
Antidilutive options outstanding excluded from diluted EPS computations	0	11,826	18,000	5,913
Stock-based compensation costs	$ 308,000	$ 147,000	$ 325,000	$ 152,000
Foreign Currency Transaction Gain (Loss), before Tax			$ 0
Stock-based compensation costs, effect on EPS	$ 0.02	$ 0.00	$ 0.02	$ 0.00
Number of Operating Segments			1
Cost of Goods and Services Sold	$ 13,702,000	$ 14,158,000	$ 28,469,000	$ 27,975,000
Selling, General and Administrative Expenses [Member]
Significant Accounting Policies [Line Items]
Advertising and promotion costs	627,000	435,000	1,141,000	1,085,000
Sales revenue, net [Member] | Shipping and Handling [Member]
Significant Accounting Policies [Line Items]
Cost of Goods and Services Sold	271,000	265,000	531,000	547,000
Cost of sales [Member]
Significant Accounting Policies [Line Items]
Research and development costs	1,823,000	1,762,000	3,572,000	3,507,000
Cost of sales [Member] | Shipping and Handling [Member]
Significant Accounting Policies [Line Items]
Cost of Goods and Services Sold	108,000	$ 103,000	220,000	$ 204,000
Allowance for doubtful accounts current [Member]
Significant Accounting Policies [Line Items]
Valuation allowances and reserves, balance	$ 127,000		$ 127,000		$ 88,000