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Long-term debt (Details) - USD ($) | 1 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2018 | Mar. 31, 2016 | Jun. 30, 2018 | Sep. 30, 2017 | Oct. 31, 2015
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt |  |  | $ 39,686,000 | $ 39,600,000 |
Debt, unamortized discount |  |  | $ 300,000 | $ 400,000 |
Gordon Brothers Finance Company | Term loan |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, term |  | 5 years |  |  |
Gordon Brothers Finance Company | Line of credit | Term loan |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt |  | $ 25,000,000 |  |  |
Debt instrument, minimum interest rate |  | 10.50% |  |  |
Gordon Brothers Finance Company | Line of credit | Term loan | London Interbank Offered Rate (LIBOR) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, basis spread on variable rate |  | 10.00% |  |  |
Gordon Brothers Finance Company | Line of credit | Term loan under Amended Term Loan |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt |  | $ 15,000,000 |  |  |
Debt instrument, minimum interest rate |  | 10.00% |  |  |
Debt, interest rate, effective percentage |  |  | 11.48% | 10.74% |
Gordon Brothers Finance Company | Line of credit | Term loan under Amended Term Loan | London Interbank Offered Rate (LIBOR) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, basis spread on variable rate |  | 9.50% |  |  |
Gordon Brothers Finance Company | Line of credit | Aggregate Term loan |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt |  | $ 40,000,000 |  |  |
Gordon Brothers Finance Company | Line of credit | Aggregate Term loan | London Interbank Offered Rate (LIBOR) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, basis spread on variable rate |  | 9.50% |  |  |
Credit facility | Credit facility | London Interbank Offered Rate (LIBOR) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, basis spread on variable rate |  |  | 1.25% | 1.25% |
Credit facility | J.P. Morgan Chase Bank, N.A. | Line of credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 80,000,000
Credit facility |  |  | $ 0 | $ 0 |
Letter of credit | J.P. Morgan Chase Bank, N.A. | Line of credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | 10,000,000
Borrowing capacity |  |  | $ 4,500,000 | $ 4,400,000 |
Swing loan | J.P. Morgan Chase Bank, N.A. | Line of credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 8,000,000
Subsequent Event | J.P. Morgan Chase Bank, N.A. | Term Loan under Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt | $ 40,000,000 |  |  |  |
Subsequent Event | J.P. Morgan Chase Bank, N.A. | Line of credit | Term Loan under Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt | $ 40,000,000 |  |  |  |
Subsequent Event | J.P. Morgan Chase Bank, N.A. | Line of credit | Term Loan under Credit Facility | London Interbank Offered Rate (LIBOR) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, basis spread on variable rate | 2.25% |  |  |  |
Subsequent Event | Credit facility | J.P. Morgan Chase Bank, N.A. | Line of credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity | $ 120,000,000 |  |  |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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