Revenues (Tables)

6 Months Ended

Dec. 31, 2018

Revenue Recognition and Deferred Revenue [Abstract]

Revenue from External Customers by Geographic Areas [Table Text Block]

The Company does not have any one single customer that represents more than 10 percent of total sales. Sales by region, and by product, are as follows:

	Sales by Region
	Three months ended				Six months ended
	December 31,				December 31,
	2018		2017		2018		2017
Domestic United States	$	5,913,530	$	6,422,393	$	11,691,515	$	12,385,080
Europe		266,783		620,765		379,939		747,726
Canada		215,163		201,339		373,323		364,622
Latin America		616,923		400,437		1,126,636		1,042,205
Middle East		53,416		426,806		146,011		544,714
Far East		1,026,382		646,026		1,642,249		1,529,175
Other International		14,801		836		16,222		1,933
	$	8,106,998	$	8,718,602	$	15,375,895	$	16,615,455

Revenue from External Customers by Products and Services [Table Text Block]

	Sales by Product
	Three months ended				Six months ended
	December 31,				December 31,
	2018		2017		2018		2017
Respiratory care products	$	2,338,533	$	2,255,437	$	4,414,837	$	4,308,794
Medical gas equipment		4,147,086		4,446,860		7,819,678		8,667,257
Emergency medical products		1,621,379		2,016,305		3,141,380		3,639,404
	$	8,106,998	$	8,718,602	$	15,375,895	$	16,615,455