Condensed Consolidated Balance Sheets (Unaudited) - USD ($)	Dec. 31, 2018	Jun. 30, 2018
Current assets:
Cash and cash equivalents	$ 10,173,286	$ 10,979,455
Accounts receivable, less allowance for doubtful accounts of $250,000 and $200,000, respectively	5,709,298	5,245,549
Inventories, net	5,711,528	5,019,886
Prepaid expenses and other current assets	601,752	611,647
Total current assets	22,195,864	21,856,537
Property, plant and equipment, net of accumulated amortization and depreciation of $9,720,862 and $9,023,235, respectively	4,473,859	4,188,378
Patents, net of accumulated amortization of $1,132,901 and $1,063,393, respectively	763,044	757,447
Goodwill	1,701,094	1,701,094
Contract assets	960,000
Intangible and other assets	451,315	517,295
Total assets	30,545,176	29,020,751
Current liabilities:
Accounts payable	3,592,287	1,794,098
Accrued expenses and other current liabilities	2,264,112	2,411,172
Deferred income	5,993	13,303
Total current liabilities	5,862,392	4,218,573
Non current liabilities	401,000	401,000
Total liabilities	6,263,392	4,619,573
Commitments and contingencies
Shareholders' equity:
Common stock, $.01 par value-shares authorized 40,000,000; 9,584,178 and 9,430,466 shares issued and outstanding in each period	95,842	94,305
Additional paid-in capital	42,143,359	39,772,973
Accumulated deficit	(17,957,417)	(15,466,100)
Total shareholders' equity	24,281,784	24,401,178
Total liabilities and shareholders' equity	$ 30,545,176	$ 29,020,751