Condensed Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities
Net income	$ 1,383,320	$ 1,069,373
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	348,749	229,900
Deferred taxes	217,000	$ 529,000
Loss on disposal of assets	1,390
Stock based compensation	226,767	$ 283,627
Tax benefit from stock-based awards	(348,000)
Changes in operating assets and liabilities:
Accounts receivable, net	991,240	$ 372,879
Inventories	239,335	31,187
Other assets	(146,494)	(222,800)
Accounts payable and accrued expenses	(1,003,144)	(1,219,481)
Net cash provided by operating activities	1,910,163	1,073,685
Cash flows from investing activities
Purchases of property, plant and equipment and intangible assets	(226,710)	(1,764,875)
Purchases of investments	(1,184,000)	(1,638,000)
Proceeds from maturities of investments	1,886,000	1,375,000
Net cash provided by (used in) investing activities	475,290	$ (2,027,875)
Cash flows from financing activities
Tax benefit from stock-based awards	348,000
Repurchase of common stock	(257,242)	$ (170,170)
Proceeds from issuance of common stock under employee stock purchase plan	118,013	105,615
Proceeds from issuance of common stock upon exercise of stock options	34,990	$ 1,276
Tax withholding related to vesting of restricted stock grants	(1,391)
Net cash provided by (used in) financing activities	242,370	$ (63,279)
Increase (decrease) in cash and cash equivalents	2,627,823	(1,017,469)
Cash and cash equivalents, beginning of period	18,071,210	18,191,493
Cash and cash equivalents, end of period	20,699,033	$ 17,174,024
Supplemental disclosures for cash flow information
Cash paid during the year for income taxes	15,884
Non-cash financing activities
Cashless exercise of stock options	$ 15,890	$ 3,220