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

3 Months Ended

9 Months Ended

12 Months Ended

Mar. 31, 2019

Mar. 31, 2018

Mar. 31, 2019

Mar. 31, 2018

Jun. 30, 2018

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

No customer accounted for more than 10% of net sales during the three months and nine months ended March 31, 2019 and 2018.

As of March 31, 2019 the Company had no customer that represents more than 10% of the total accounts receivable balance. As of June 30, 2018 the Company had one customer that represents approximately 11% of the total accounts receivable balance.

Major Supplier

Our three largest suppliers accounted for 27%, 13% and 10% of the total purchase for the three-month period ended March 31, 2019. One largest supplier accounted for 40% of the total purchase for the three-month period ended March 31, 2018. Our two largest suppliers accounted for 31% and 10% of total purchases for the nine-month period ended March 31, 2019 and one largest supplier accounted for 38% of total purchase for the nine-month period ended March 31, 2018.

Foreign Sales

Domestic and international sales from continuing operations are as follows:



	For the Three Months Ended March 31,								For the Nine Months Ended March 31,
	2019				2018				2019				2018
Domestic	$	1,509,189	56.6	%	$	1,556,978	59.1	%	$	4,422,034	60.2	%	$	5,153,681	59.6	%
Foreign	1,159,481		43.4	%	1,078,504		40.9	%	2,923,899		39.8	%	3,494,453		40.4	%
Total	$	2,668,670	100.0	%	$	2,635,482	100.0	%	$	7,345,933	100.0	%	$	8,648,134	100.0	%