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Income Taxes: (Tables) | 12 Months Ended
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Sep. 30, 2013
Income Taxes: |
Schedule of components of income taxes |
|  | For the Fiscal Year Ended September 30, |
|  | 2013 |  | 2012 |  | 2011 |
Current provision (benefit): |  |  |  |  |  |  |
Federal |  | $ | 432,211 |  | $ | 46,792 |  | $ | 183,527 |
State |  | (2,731 | ) | (9,476 | ) | (518 | )
Total current provision |  | 429,480 |  | 37,316 |  | 183,009 |
Deferred (benefit) provision: |  |  |  |  |  |  |
Federal |  | (255,154 | ) | (2,435,049 | ) | — |
State |  | (54,484 | ) | 670 |  | 751 |
Total deferred (benefit) provision |  | (309,638 | ) | (2,434,379 | ) | 751 |
Total current and deferred (benefit) provision |  | $ | 119,842 |  | $ | (2,397,063 | ) | $ | 183,760 |
Schedule of reconciliation of the statutory federal rate to the Company's effective income tax rate |
|  | For the Fiscal Year Ended September 30, |
|  | 2013 |  | 2012 |  | 2011 |
U.S. Federal statutory tax rate |  | 34.0 | % | 34.0 | % | 34.0 | %
State income taxes, net of federal benefit |  | (1.3 | )% | 6.5 | % | (7.1 | )%
Permanent items |  | (2.9 | )% | (1.8 | )% | (0.4 | )%
Research and development tax credits |  | (27.4 | )% | (3.6 | )% | (27.5 | )%
Valuation allowance |  | (0.8 | )% | (433.5 | )% | 14.2 | %
Change in unrecognized tax benefits |  | 4.4 | % | (13.5 | )% | 7.2 | %
Effective income tax rate |  | 6.0 | % | (411.9 | )% | 20.4 | %
Schedule of deferred tax assets and liabilities |
|  | As of September 30, |
|  | 2013 |  | 2012 |
|  | Current |  | Non Current |  | Current |  | Non Current |
Deferred tax assets: |  |  |  |  |  |  |  |  |
Reserves and accruals |  | $ | 1,657,601 |  | $ | 196,312 |  | $ | 1,514,711 |  | $ | 240,390 |
Research and development credits |  | 349,195 |  | 548,952 |  | 80,000 |  | 774,318 |
NOL carryforwards - state |  | 1,600 |  | 1,246,615 |  | — |  | 1,236,554 |
Stock options |  | — |  | 714,040 |  | — |  | 614,087 |
Depreciation |  | — |  | (626,063 | ) | — |  | (576,589 | )
Other |  | — |  | 4,023 |  | — |  | 6,304 |
|  | 2,008,396 |  | 2,083,879 |  | 1,594,711 |  | 2,295,064 |
Less valuation allowance |  | (5,717 | ) | (1,432,881 | ) | (6,549 | ) | (1,448,177 | )
Total net deferred tax assets |  | 2,002,679 |  | 650,998 |  | 1,588,162 |  | 846,887 |
Deferred tax liabilities: |  |  |  |  |  |  |  |  |
Depreciation |  | — |  | (132,202 | ) | — |  | (128,998 | )
Total deferred tax liabilities |  | — |  | (132,202 | ) | — |  | (128,998 | )
Net deferred tax asset |  | $ | 2,002,679 |  | $ | 518,796 |  | $ | 1,588,162 |  | $ | 717,889 |
Schedule of reconciliation of beginning and ending balances of total amounts of gross unrecognized tax benefits |
|  | For the Fiscal Year Ended September 30, |
|  | 2013 |  | 2012 |  | 2011 |
Balance at beginning of year |  | $ | 403,000 |  | $ | 491,000 |  | $ | 425,000 |
Unrecognized tax benefits related to prior years |  | — |  | — |  | — |
Unrecognized tax benefits related to current year |  | 120,000 |  | 12,000 |  | 67,000 |
Settlements |  | — |  | — |  | — |
Decrease in unrecognized tax benefits due to the lapse of applicable statute of limitations |  | (31,000 | ) | (100,000 | ) | (1,000 | )
Balance at end of year |  | $ | 492,000 |  | $ | 403,000 |  | $ | 491,000 |

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
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