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Income Taxes (Details) (USD $)	3 Months Ended	9 Months Ended
Income Taxes (Details) (USD $)	Jun. 30, 2012	Jun. 30, 2012	Sep. 30, 2011
Income Taxes
Valuation allowance related to Minnesota R&D credit carryovers	$ 42,000	$ 42,000	$ 42,000
Effective income tax rate (as a percent)	33.00%	32.00%
Unrecognized tax benefits	38,000	38,000
Gross unrecognized tax benefit which would benefit effective tax rate if the company were to prevail on all unrecognized tax benefits	$ 38,000	$ 38,000

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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