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Statements of Shareholders' Equity (USD $) | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Total
--- | --- | --- | --- | ---
Balance at Sep. 30, 2011 | $ 122,707 | $ 53,402,138 | $ (27,295,674) | $ 26,229,171
Balance (in Shares) at Sep. 30, 2011 | 12,270,691 |  |  |
Stock-based compensation expense |  | 467,120 |  | 467,120
Restricted Stock Issuance, Net | 3,590 |  |  | 3,590
Restricted Stock Issuance, Net (in Shares) | 359,000 |  |  |
Employee stock purchase plan | 288 | 142,254 |  | 142,542
Employee stock purchase plan (in Shares) | 28,929 |  |  |
Exercise of stock options | 1,716 | 140,568 |  | 142,284
Exercise of stock options (in Shares) | 171,480 |  |  |
Net income |  |  | 7,701,194 | 7,701,194
Balance at Sep. 30, 2012 | 128,301 | 54,152,080 | (19,594,480) | 34,685,901
Balance (in Shares) at Sep. 30, 2012 | 12,830,100 |  |  |
Stock-based compensation expense |  | 753,727 |  | 753,727
Restricted Stock Issuance, Net | 41 | 25 |  | 66
Restricted Stock Issuance, Net (in Shares) | 4,090 |  |  |
Employee stock purchase plan | 356 | 135,625 |  | 135,981
Employee stock purchase plan (in Shares) | 35,597 |  |  |
Exercise of stock options | 1,394 | 62,606 |  | 64,000
Exercise of stock options (in Shares) | 139,455 |  |  |
Tax witholding related to vesting of restricted stock grants and excercise of stock options | (349) | (297,639) |  | (297,988)
Tax witholding related to vesting of restricted stock grants and excercise of stock options (in Shares) | (34,979) |  |  |
Excess tax benefit of stock options exercised |  | 2,505 |  | 2,505
Net income |  |  | 4,733,844 | 4,733,844
Balance at Sep. 30, 2013 | 129,743 | 54,808,929 | (14,860,636) | 40,078,036
Balance (in Shares) at Sep. 30, 2013 | 12,974,263 |  |  |
Stock-based compensation expense |  | 794,865 |  | 794,865
Restricted Stock Issuance, Net | 3,056 | (3,056) |  |
Restricted Stock Issuance, Net (in Shares) | 305,615 |  |  |
Employee stock purchase plan | 176 | 185,408 |  | 185,584
Employee stock purchase plan (in Shares) | 17,589 |  |  |
Exercise of stock options | 4,716 | 641,737 |  | 646,453
Exercise of stock options (in Shares) | 471,603 |  |  |
Tax witholding related to vesting of restricted stock grants and excercise of stock options | (261) | (399,368) |  | (399,629)
Tax witholding related to vesting of restricted stock grants and excercise of stock options (in Shares) | (26,106) |  |  |
Excess tax benefit of stock options exercised |  | 8,474 |  | 8,474
Net income |  |  | 5,432,851 | 5,432,851
Balance at Sep. 30, 2014 | $ 137,430 | $ 56,036,989 | $ (9,427,785) | $ 46,746,634
Balance (in Shares) at Sep. 30, 2014 | 13,742,964 |  |  |

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