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Liquidity (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ 5,558,000 |  |  |  | $ 3,908,000 |  |  |  | $ 5,558,000 | $ 3,908,000 | $ 3,408,000
Net working capital | 4,600,000 |  |  |  |  |  |  |  | 4,600,000 |  |
Income before taxes | 2,424,000 | $ 729,000 | $ (136,000) | $ 223,000 | $ 178,000 | $ 251,000 | $ 198,000 | $ 133,000 | 3,240,000 | $ 760,000 |
Amount of unused availability under the line | 2,640,000 |  |  |  |  |  |  |  | 2,640,000 |  |
Line of Credit [Member] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum availability | 6,000,000 |  |  |  |  |  |  |  | 6,000,000 |  |
Amount of unused availability under the line | 1,290,000 |  |  |  |  |  |  |  | 1,290,000 |  |
Unbilled receivables |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum availability | $ 1,000,000 |  |  |  |  |  |  |  | $ 1,000,000 |  |
Interest rate (percent) | 4.00% |  |  |  | 4.00% |  |  |  | 4.00% | 4.00% |
Accounts receivables |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum availability | $ 3,000,000 |  |  |  |  |  |  |  | $ 3,000,000 |  |
Interest rate (percent) | 4.00% |  |  |  |  |  |  |  | 4.00% |  |
Letter of Credit [Member] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount of unused availability under the line | $ 1,350,000 |  |  |  |  |  |  |  | $ 1,350,000 |  |

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