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Income Taxes (Details) (USD $)	3 Months Ended	6 Months Ended
Income Taxes (Details) (USD $)	Mar. 31, 2013	Mar. 31, 2013	Sep. 30, 2012
Income taxes
Valuation allowance	$ 216,000	$ 216,000	$ 216,000
Effective income tax rate (as a percent)	30.00%	29.00%
Unrecognized tax benefits	48,000	48,000
Gross unrecognized tax benefit which would benefit effective tax rate if the company were to prevail on all unrecognized tax benefits	48,000	48,000
Minnesota
Income taxes
Valuation allowance	42,000	42,000	42,000
U.S. federal
Income taxes
Valuation allowance	$ 174,000	$ 174,000	$ 174,000

- 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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