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Income Taxes: (Details 4) (USD $) | 12 Months Ended
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Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2010
Tax credit carryforward |  |  |
Decrease in valuation allowance | $ 2,400,000 | $ 48,000 |
Reconciliation of beginning and ending balances of total amounts of gross unrecognized tax benefits |  |  |
Balance at beginning of year | 491,000 | 425,000 | 474,000
Unrecognized tax benefits related to current year | 12,000 | 67,000 | 34,000
Decrease in unrecognized tax benefits due to the lapse of applicable statute of limitations | (100,000) | (1,000) | (83,000)
Balance at end of year | 403,000 | 491,000 | 425,000
Unrecognized tax benefits , if recognized, would impact effective tax rate | 403,000 | 491,000 | 425,000
Interest accrued, net of tax benefits | 4,000 | 12,000 |
Expense (benefit) for interest (net of federal impact) recognized | (8,000) | 4,000 | (10,000)
R&D | Federal |  |  |
Tax credit carryforward |  |  |
Tax Credit carryforwards | 646,000 |  |
Reversal in valuation allowance | 2,400,000 |  |
R&D | State |  |  |
Tax credit carryforward |  |  |
Tax Credit carryforwards | $ 208,000 |  |

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- Definition The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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