Condensed Consolidated Balance Sheets (Unaudited) - USD ($)	Mar. 31, 2019	Jun. 30, 2018
Current assets:
Cash and cash equivalents	$ 9,012,220	$ 10,979,455
Accounts receivable, less allowance for doubtful accounts of $160,000 and $200,000, respectively	5,333,839	5,245,549
Inventories, net	6,332,586	5,019,886
Prepaid expenses and other current assets	864,452	611,647
Total current assets	21,543,097	21,856,537
Property, plant and equipment, net of accumulated amortization and depreciation of $10,097,703 and $9,023,235, respectively	4,394,548	4,188,378
Patents, net of accumulated amortization of $1,169,131 and $1,063,393, respectively	779,621	757,447
Goodwill	1,701,094	1,701,094
Contract assets	960,000
Intangible and other assets	433,842	517,295
Total assets	29,812,202	29,020,751
Current liabilities:
Accounts payable	3,521,657	1,794,098
Accrued expenses and other current liabilities	2,325,023	2,411,172
Deferred income	3,995	13,303
Total current liabilities	5,850,675	4,218,573
Non current liabilities	401,000	401,000
Total liabilities	6,251,675	4,619,573
Commitments and contingencies
Shareholders' equity:
Common stock, $.01 par value-shares authorized 40,000,000; 9,641,103 and 9,430,466 shares issued and outstanding in each period	96,411	94,305
Additional paid-in capital	43,011,214	39,772,973
Accumulated deficit	(19,547,098)	(15,466,100)
Total shareholders' equity	23,560,527	24,401,178
Total liabilities and shareholders' equity	$ 29,812,202	$ 29,020,751