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Liquidity (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2016 | Mar. 31, 2015 | Sep. 30, 2015 | Sep. 30, 2014
Cash and Cash Equivalents [Abstract] |  |  |  |  |  |
Cash and cash equivalents | $ 6,934 | $ 4,222 | $ 6,934 | $ 4,222 | $ 5,558 | $ 3,908
Net working capital | 5,300 |  | 5,300 |  |  |
Accumulated deficit | (53,295) |  | (53,295) |  | $ (53,516) |
Operating income | 689 | 515 | 1,071 | 774 |  |
Net income | 337 | $ (82) | $ 221 | $ 52 |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Document Period End Date |  |  | Mar. 31, 2016 |  |  |
Amount of unused availability under the line | 2,500 |  | $ 2,500 |  |  |
Line of Credit |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Maximum availability | 6,000 |  | 6,000 |  |  |
Amount of unused availability under the line | 1,600 |  | 1,600 |  |  |
Accounts receivables |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Maximum availability | $ 3,000 |  | $ 3,000 |  |  |
Interest rate (percent) | 4.00% |  | 4.00% |  |  |
Unbilled receivables |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Interest rate (percent) | 4.00% |  | 4.00% |  | 4.00% |

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