Segment Information - Disaggregation information of sales by region (Details) - USD ($)	3 Months Ended								12 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Net sales	$ 7,018,000	$ 7,967,000	$ 11,104,000	$ 10,190,000	$ 8,511,000	$ 8,097,000	$ 7,310,000	$ 7,976,000	$ 36,279,476	$ 31,894,262	$ 31,381,521
Domestic United States
Segment Reporting Information [Line Items]
Net sales									24,162,321	23,138,276	23,541,614
Europe
Segment Reporting Information [Line Items]
Net sales									4,069,672	1,422,660	877,308
Canada
Segment Reporting Information [Line Items]
Net sales									1,310,440	829,901	758,145
Latin America
Segment Reporting Information [Line Items]
Net sales									2,819,165	3,122,929	2,450,969
Middle East
Segment Reporting Information [Line Items]
Net sales									1,189,139	693,716	464,470
Far East
Segment Reporting Information [Line Items]
Net sales									2,727,508	2,686,206	3,259,905
Other International
Segment Reporting Information [Line Items]
Net sales									$ 1,231	$ 574	$ 29,110