Nature of Business and Summary of Significant Accounting Policies - Additional Information (Details)		12 Months Ended
	Jul. 01, 2019 USD ($)	Jun. 30, 2020 USD ($) segment $ / shares shares	Jun. 30, 2019 USD ($) $ / shares shares
Significant Accounting Policies [Line Items]
Carrying amount of long-term debt, including current portion		$ 2,110,000
Short-term time deposits		460,000	$ 460,000
Intangible assets amortization expense		264,000	$ 313,000
Estimated amortization expense- 2021		425,000
Estimated amortization expense - 2022		390,000
Estimated amortization expense - 2023		362,000
Estimated amortization expense - 2024		336,000
Estimated amortization expense- 2025		$ 315,000
Remaining weighted average amortization period for acquired intangible assets		17 years 6 months	9 years 1 month 6 days
Research and development costs		$ 7,257,000	$ 7,212,000
Antidilutive options outstanding excluded from diluted EPS computations | shares		38,819	2,957
Stock-based compensation costs		$ 583,000	$ 160,000
Foreign Currency Transaction Gain (Loss), before Tax		$ 0	$ 0
Stock-based compensation costs, effect on EPS | $ / shares		$ 0.03	$ 0.01
Number of Operating Segments | segment		1
Cost of Goods and Services Sold		$ 57,767,000	$ 59,042,000
Impairment of intangible asset		1,852,000	0
Operating Lease, Liability	$ 7,700,000
Operating Lease, Right-of-Use Asset	$ 7,700,000	7,395,000	0
Package of practical expedients	true
Selling, General and Administrative Expenses [Member]
Significant Accounting Policies [Line Items]
Advertising and promotion costs		1,722,000	2,047,000
Sales revenue, net [Member] | Shipping and Handling [Member]
Significant Accounting Policies [Line Items]
Cost of Goods and Services Sold		1,034,000	1,115,000
Cost of sales [Member]
Significant Accounting Policies [Line Items]
Research and development costs		7,257,000	7,212,000
Cost of sales [Member] | Shipping and Handling [Member]
Significant Accounting Policies [Line Items]
Cost of Goods and Services Sold		452,000	430,000
Allowance for doubtful accounts current
Significant Accounting Policies [Line Items]
Valuation allowances and reserves, balance		$ 326,000
Returns and other allowances
Significant Accounting Policies [Line Items]
Valuation allowances and reserves, balance			$ 88,000
Customer relationships
Significant Accounting Policies [Line Items]
Finite-Lived Intangible Asset, Useful Life		20 years
Trade name
Significant Accounting Policies [Line Items]
Finite-Lived Intangible Asset, Useful Life		20 years
Impairment of intangible asset		$ 1,852,000