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Income Taxes: (Details 2) (USD $) | 1 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2010 | Sep. 30, 2013 | Sep. 30, 2012
Income Taxes: |  |  |
Extension period of research and development tax credit | 2 years |  |
Current deferred tax assets: |  |  |
Reserves and accruals |  | $ 1,657,601 | $ 1,514,711
Research and development credits |  | 349,195 | 80,000
NOL carryforwards-state |  | 1,600 |
Gross current deferred tax assets |  | 2,008,396 | 1,594,711
Less valuation allowance, current |  | (5,717) | (6,549)
Total net current deferred tax assets |  | 2,002,679 | 1,588,162
Net current deferred tax asset |  | 2,002,679 | 1,588,162
Non current deferred tax assets: |  |  |
Reserves and accruals |  | 196,312 | 240,390
Research and development credit |  | 548,952 | 774,318
NOL carryforwards-state |  | 1,246,615 | 1,236,554
Stock options |  | 714,040 | 614,087
Depreciation |  | (626,063) | (576,589)
Other |  | 4,023 | 6,304
Gross non current deferred tax assets |  | 2,083,879 | 2,295,064
Less valuation allowance, non current |  | (1,432,881) | (1,448,177)
Total net non current deferred tax assets |  | 650,998 | 846,887
Non current deferred tax liabilities: |  |  |
Depreciation |  | (132,202) | (128,998)
Total non current deferred tax liabilities |  | (132,202) | (128,998)
Net non current deferred tax asset |  | $ 518,796 | $ 717,889

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