Concentration of credit risk (Details) - USD ($)	12 Months Ended
Jun. 30, 2021	Jun. 30, 2020
Concentration Risk [Line Items]
Concentration Risk, Supplier	two	two
Customer Concentration Risk [Member] \| Customer One [Member]
Concentration Risk [Line Items]
Concentration Risk, Customer	One	One
Geographic Concentration Risk [Member]
Concentration Risk [Line Items]
Revenues	$ 10,472,000	$ 9,400,000
Accounts Receivable
Concentration Risk [Line Items]
Concentration Risk, Customer	one	one
Accounts Receivable \| Customer Concentration Risk [Member] \| Customer One [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	23.00%	18.00%
Accounts Payable Benchmark [Member] \| Supplier Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration Risk, Supplier	two
Revenue Benchmark \| Customer Concentration Risk [Member] \| Customer One [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	15.00%	16.00%
Revenue Benchmark \| Geographic Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	100.00%	100.00%
Domestic [Member] \| Geographic Concentration Risk [Member]
Concentration Risk [Line Items]
Revenues	$ 6,255,000	$ 5,781,000
Domestic [Member] \| Revenue Benchmark \| Geographic Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	59.70%	61.50%
International [Member] \| Geographic Concentration Risk [Member]
Concentration Risk [Line Items]
Revenues	$ 4,217,000	$ 3,619,000
International [Member] \| Revenue Benchmark \| Geographic Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	40.30%	38.50%
Supplier one [Member] \| Accounts Payable Benchmark [Member] \| Supplier Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	39.00%	38.00%
Supplier one [Member] \| Revenue Benchmark \| Supplier Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	40.00%	37.00%
Supplier two [Member] [Member] \| Accounts Payable Benchmark [Member] \| Supplier Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	12.00%	12.00%
Supplier two [Member] [Member] \| Revenue Benchmark \| Supplier Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	10.00%	10.00%
supplier three \| Accounts Payable Benchmark [Member] \| Supplier Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage		11.00%

Description of risks that arise due to the volume of business transacted with a particular customer. At a minimum, the description informs financial statement users of the general nature of the risk, but excludes "Information about Major Customers" that may be disclosed elsewhere (for instance, segment disclosures).

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Description of risks that arise due to the volume of business transacted with a particular supplier or reliance placed on that supplier. At a minimum, the description informs financial statement users of the general nature of the risk.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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