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Statements Of Cash Flows (USD $) | 12 Months Ended
--- | ---
Sep. 30, 2013 | Sep. 30, 2012
Net income | $ 4,733,844 | $ 7,701,194
Adjustments to reconcile net income to cash provided by operating activities: |  |
Depreciation and amortization | 476,400 | 404,765
Deferred income taxes | 2,564,045 | (3,436,931)
Gain on sale of assets | 15,388 | 23,645
Stock-based compensation expense | 753,727 | 470,710
Accounts receivable, net | (4,814,907) | 206,228
Inventories | (2,655,150) | (212,854)
Other current assets | (15,157) | (307,410)
Accounts payable and accrued expenses | 3,280,866 | (1,023,016)
Net cash provided by operating activities | 4,339,056 | 3,826,331
Cash flows from investing activities: |  |
Purchases of property and equipment | (1,018,453) | (550,618)
Purchase of investments | (8,683,000) | (11,942,000)
Proceeds from sale of property and equipment | 6,500 |
Patent additions | (18,853) | (40,423)
Sale of investments | 9,600,000 | 2,819,000
Net cash used in investing activities | (113,806) | (9,714,041)
Cash flows from financing activities: |  |
Proceeds from issuance of common stock under employee stock purchase plan | 135,981 | 142,542
Proceeds from issuance of common stock | 64,066 | 142,284
Excess tax benefit from exercise of stock options | 2,505 |
Tax withholding related to vesting of restricted stock grants and exercise of stock options | (297,988) |
Net cash (used in) provided by financing activities | (95,436) | 284,826
Increase (decrease) in cash and cash equivalents | 4,129,814 | (5,602,884)
Cash and cash equivalents at beginning of year | 5,678,143 | 11,281,027
Cash and cash equivalents at end of year | 9,807,957 | 5,678,143
Supplemental cash flow information: Cash paid during the year for: |  |
Income taxes | $ 153,644 | $ 163,756

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