Condensed Consolidated Balance Sheets (Unaudited) - USD ($)	Sep. 30, 2018	Jun. 30, 2018
Current assets:
Cash and cash equivalents	$ 9,322,811	$ 10,979,455
Accounts receivable, less allowance for doubtful accounts of $200,000 and $200,000, respectively	5,535,271	5,245,549
Inventories, net	4,920,350	5,019,886
Prepaid expenses and other current assets	583,314	611,647
Total current assets	20,361,746	21,856,537
Property, plant and equipment, net of accumulated amortization and depreciation of $9,355,964 and $9,023,235, respectively	4,346,826	4,188,378
Patents, net of accumulated amortization of $1,097,252 and $1,063,393, respectively	773,668	757,447
Goodwill	1,701,094	1,701,094
Contract assets	960,000
Intangible and other assets	468,013	517,295
Total assets	28,611,347	29,020,751
Current liabilities:
Accounts payable	2,082,704	1,794,098
Accrued expenses and other current liabilities	2,344,903	2,812,172
Total current liabilities	4,427,607	4,606,270
Deferred income	13,303	13,303
Total liabilities	4,440,910	4,619,573
Shareholders' equity:
Common stock, $.01 par value-shares authorized 40,000,000; 9,481,251 and 9,430,466 shares issued and outstanding in each period	94,822	94,305
Additional paid-in capital	41,192,701	39,772,973
Accumulated deficit	(17,117,086)	(15,466,100)
Total shareholders' equity	24,170,437	24,401,178
Total liabilities and shareholders' equity	$ 28,611,347	$ 29,020,751