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Income Taxes: (Details 2) (USD $) | 1 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2010 | Sep. 30, 2012 | Sep. 30, 2011
Income Taxes: |  |  |
Extension period of research and development tax credit | 2 years |  |
Current deferred tax assets: |  |  |
Deferred revenue |  |  | $ 3,058
Reserves and accruals |  | 1,514,711 | 1,677,183
Research and development credits |  | 80,000 | 80,000
Gross current deferred tax assets |  | 1,594,711 | 1,760,241
Less: Valuation allowance , current |  | (6,549) | (1,307,517)
Total current deferred tax assets |  | 1,588,162 | 452,724
Current deferred tax liabilities: |  |  |
Other |  |  | (14,089)
Total current deferred tax liabilities |  |  | (14,089)
Net current deferred tax asset (liability) |  | 1,588,162 | 438,635
Non current deferred tax assets: |  |  |
Reserves and accruals |  | 240,390 | 238,179
Research and development credit |  | 774,318 | 848,669
NOL carryforwards-state |  | 1,236,554 | 1,226,649
Stock options |  | 614,087 | 503,978
Other |  | 6,304 | 12,973
Gross non current deferred tax assets |  | 2,871,653 | 2,830,448
Less: Valuation allowance, non current |  | (1,448,177) | (2,696,113)
Total non current deferred tax assets |  | 1,423,476 | 134,335
Non current deferred tax liabilities: |  |  |
Depreciation |  | (705,587) | (701,298)
Total non current deferred tax liabilities |  | (705,587) | (701,298)
Net non current deferred tax asset (liability) |  | $ 717,889 | $ (566,963)

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