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Statements of Cash Flows (USD $) | 12 Months Ended
--- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Net income | $ 5,432,851 | $ 4,733,844 | $ 7,701,194
Adjustments to reconcile net income to cash provided by operating activities: |  |  |
Depreciation and amortization | 699,869 | 476,400 | 404,765
Deferred income taxes | 3,019,626 | 2,564,045 | (3,436,931)
Loss on sale of assets | 12,809 | 15,388 | 23,645
Stock-based compensation expense | 794,865 | 753,727 | 470,710
Changes in operating assets and liabilities: |  |  |
Accounts receivable, net | 2,809,687 | (4,814,907) | 206,228
Inventories | 236,422 | (2,655,150) | (212,854)
Other current assets | (243,339) | (15,157) | (307,410)
Accounts payable and accrued expenses | (1,234,039) | 3,280,866 | (1,023,016)
Net cash provided by operating activities | 11,528,751 | 4,339,056 | 3,826,331
Cash flows from investing activities: |  |  |
Purchases of property and equipment | (1,418,461) | (1,018,453) | (550,618)
Purchase of investments | (8,899,000) | (8,683,000) | (11,942,000)
Proceeds from sale of property and equipment | 40,908 | 6,500 |
Patent additions | (36,544) | (18,853) | (40,423)
Sale of investments | 6,727,000 | 9,600,000 | 2,819,000
Net cash used in investing activities | (3,586,097) | (113,806) | (9,714,041)
Cash flows from financing activities: |  |  |
Proceeds from issuance of common stock under employee stock purchase plan | 185,584 | 135,981 | 142,542
Proceeds from issuance of common stock | 646,453 | 64,066 | 142,284
Excess tax benefit from exercise of stock options | 8,474 | 2,505 |
Tax withholding related to vesting of restricted stock grants and exercise of stock options | (399,629) | (297,988) |
Net cash provided by (used in) financing activities | 440,882 | (95,436) | 284,826
Increase (decrease) in cash and cash equivalents | 8,383,536 | 4,129,814 | (5,602,884)
Cash and cash equivalents at beginning of year | 9,807,957 | 5,678,143 | 11,281,027
Cash and cash equivalents at end of year | 18,191,493 | 9,807,957 | 5,678,143
Supplemental cash flow information |  |  |
Cash paid during the year for income taxes | 361,284 | 153,644 | 163,756
Non-cash financing activities |  |  |
Cashless exercise of stock options | $ 297,883 | $ 242,848 | $ 51,226

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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
Name: | us-gaap_ShareBasedCompensation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_SupplementalCashFlowInformationAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration