Concentration of credit risk (Details) - USD ($)

3 Months Ended

9 Months Ended

12 Months Ended

Mar. 31, 2020

Mar. 31, 2019

Mar. 31, 2020

Mar. 31, 2019

Jun. 30, 2019

Concentration Risk [Line Items]

Schedules of Concentration of Risk, by Risk Factor [Table Text Block]

Concentration of Credit Risk

Credit Risk

Financial Instruments, which potentially subject the Company to concentration of credit risk, consist principally of cash and cash equivalents, restricted cash and trade receivables. Concentration of credit risk with respect to trade receivables is generally diversified due to the large number of entities comprising the Company's customer base and their dispersion across geographic areas principally within the United States and international. The Company routinely address the financial strength of its customer and, as a consequence, believes that its receivable credit risk exposure is limited. The Company does not require customers to post collateral.

Major Customer

One customer accounted for more than 10% of net sales during the three months and nine-month periods ended March 31, 2020. No customer accounted for more than 10% of net sales during the three months and nine-month periods ended March 31, 2019.

As of March 31, 2020 the Company had one customer that represents approximately 10% of the total accounts receivable balance. As of June 30, 2019 the Company had no customer that represents more than 10% of the total accounts receivable balance.

Major Supplier

The Company's two largest supplier accounted for 38% and 18% of the total purchase for the three-month period ended March 31, 2020. The Company's three largest suppliers accounted for 27%, 13% and 10% of the total purchase for the three-month period ended March 31, 2019. The Company's two largest suppliers accounted for 34% and 13% of the total purchase for the nine-month period ended March 31, 2020. The Company's two largest suppliers accounted for the total purchases for more than 31% and 10% of total purchase for the nine-month period ended March 31, 2019.

Foreign Sales

Domestic and international sales from continuing operations are as follows:



(in thousands)	For the Three Months Ended March 31,								For the Nine Months Ended March 31,
	2020				2019				2020				2019
Domestic	$	1,440	61.1	%	$	1,509	56.6	%	$	4,496	60.9	%	$	4,422	60.2	%
Foreign	917		38.9	%	1,159		43.4	%	2,889		39.1	%	2,924		39.8	%
Total	$	2,357	100.0	%	$	2,669	100.0	%	$	7,385	100.0	%	$	7,346	100.0	%