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Income Taxes: (Tables) | 12 Months Ended
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Sep. 30, 2015
Income Taxes: |
Schedule of components of income taxes |
|  | For the Fiscal Year Ended September 30, |
|  | 2015 |  | 2014 |  | 2013 |
Current provision (benefit): |  |  |  |  |  |  |
Federal |  | $ | (375,936 | ) | $ | 614,729 |  | $ | 432,211 |
State |  | (10,146 | ) | 363 |  | (2,731 | )
Total current provision (benefit) |  | (386,082 | ) | 615,092 |  | 429,480 |
Deferred provision (benefit): |  |  |  |  |  |  |
Federal |  | 2,598,050 |  | (857,049 | ) | (255,154 | )
State |  | 91,510 |  | (41,665 | ) | (54,484 | )
Total deferred provision (benefit) |  | 2,689,560 |  | (898,714 | ) | (309,638 | )
Total current and deferred provision (benefit) |  | $ | 2,303,478 |  | $ | (283,622 | ) | $ | 119,842 |
Schedule of reconciliation of the statutory federal rate to the Company's effective income tax rate |
|  | For the Fiscal Year Ended September 30, |
|  | 2015 |  | 2014 |  | 2013 |
U.S. Federal statutory tax rate |  | 34.0 | % | 34.0 | % | 34.0 | %
State income taxes, net of federal benefit |  | 0.0 | % | 29.6 | % | (1.3 | )%
Permanent items |  | (2.5 | )% | 123.9 | % | (2.9 | )%
Research and development tax credits |  | 17.4 | % | 190.4 | % | (27.4 | )%
Valuation allowance |  | (111.0 | )% | 3.9 | % | (0.8 | )%
Change in unrecognized tax benefits |  | (2.6 | )% | (41.5 | )% | 4.4 | %
Effective income tax rate |  | (64.7 | )% | 340.3 | % | 6.0 | %
Schedule of deferred tax assets and liabilities |
|  | As of September 30, |
|  | 2015 |  | 2014 |
|  | Current |  | Non Current |  | Current |  | Non Current |
Deferred tax assets: |  |  |  |  |  |  |  |  |
Reserves and accruals |  | $ | 3,181,540 |  | $ | 139,717 |  | $ | 2,880,747 |  | $ | 170,562 |
Research and development credit |  | — |  | 1,472,421 |  | 396,276 |  | 208,384 |
NOL carryforwards - state |  | — |  | 1,200,156 |  | 5,500 |  | 1,237,553 |
Depreciation |  | — |  | (741,736 | ) | — |  | (795,050 | )
Stock options |  | — |  | 678,316 |  | — |  | 630,160 |
Other |  | — |  | 897 |  | — |  | 4,105 |
|  | 3,181,540 |  | 2,749,771 |  | 3,282,523 |  | 1,455,714 |
Less: Valuation allowance |  | (2,248,041 | ) | (3,123,487 | ) | (37,300 | ) | (1,398,007 | )
Total deferred tax assets |  | 933,499 |  | (373,716 | ) | 3,245,223 |  | 57,707 |
Deferred tax liabilities: |  |  |  |  |  |  |  |  |
Depreciation |  | — |  | (133,468 | ) | — |  | (132,999 | )
Other |  | — |  | — |  | — |  | — |
Total deferred tax liabilities |  | — |  | (133,468 | ) | — |  | (132,999 | )
Net deferred tax asset (liability) |  | $ | 933,499 |  | $ | (507,184 | ) | $ | 3,245,223 |  | $ | (75,292 | )
Schedule of reconciliation of beginning and ending balances of total amounts of gross unrecognized tax benefits |
|  | For the Fiscal Year Ended September 30, |
|  | 2015 |  | 2014 |  | 2013 |
Balance at beginning of year |  | $ | 526,000 |  | $ | 492,000 |  | $ | 403,000 |
Unrecognized tax benefits related to prior years |  | — |  | 1,500 |  | — |
Unrecognized tax benefits related to current year |  | 125,000 |  | 32,500 |  | 120,000 |
Decrease in unrecognized tax benefits due to the lapse of applicable statute of limitations |  | (36,000 | ) | — |  | (31,000 | )
Balance at end of year |  | $ | 615,000 |  | $ | 526,000 |  | $ | 492,000 |

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