Consolidated Balance Sheets - USD ($)	Jun. 30, 2017	Jun. 30, 2016
Current assets:
Cash and cash equivalents	$ 11,557,071	$ 9,049,327
Accounts receivable, less allowance for doubtful accounts of $96,868 and $96,868, respectively	5,133,389	3,869,427
Inventories, net	4,992,434	5,822,935
Prepaid expenses and other current assets	918,899	530,564
Total current assets	22,601,793	19,272,253
Property, plant and equipment, net of accumulated amortization and depreciation of $7,794,580 and $6,976,282, respectively	3,730,203	2,492,815
Patents, net of accumulated amortization of $995,568 and $885,394, respectively	719,136	604,916
Goodwill	1,701,094	1,701,094
Intangible and other assets	282,876	266,603
Deferred income tax	4,334,547	3,394,690
Total assets	33,369,649	27,732,371
Current liabilities:
Accounts payable	1,861,228	1,402,797
Accrued expenses and other current liabilities	3,346,138	1,887,337
Total current liabilities	5,207,366	3,290,134
Deferred lease liability	9,354	9,262
Deferred income	13,087	31,685
Total liabilities	5,229,807	3,331,081
Commitments and contingencies (Note 7)
Shareholders' equity:
Common stock, $.01 par value-shares authorized 20,000,000; 9,357,166 and 7,948,234 shares issued and 9,357,166 and 7,809,385 outstanding in each period, respectively	93,572	79,482
Additional paid-in capital	36,808,810	32,502,521
Accumulated deficit	(8,762,540)	(7,081,361)
Treasury stock, at cost, 0 and 138,849 shares, respectively		(1,099,352)
Total shareholders' equity	28,139,842	24,401,290
Total liabilities and shareholders' equity	$ 33,369,649	$ 27,732,371