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Short-term and long-term debt - Additional Information (Detail) |  |  | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 08, 2016 USD ($) | Jul. 02, 2015 | Sep. 30, 2013 | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Feb. 15, 2013 USD ($) | Jun. 01, 2012 USD ($)
Credit facility maximum borrowing |  |  |  | $ 50,000,000 |  | $ 40,000,000 |
Capital leased assets gross |  |  |  | 249,000 |  |  |
Principal balance of this mortgage note |  |  |  | 93,000 | $ 260,000 |  |
Line of Credit Facility, Current Borrowing Capacity |  |  |  | 44,000,000 |  |  |
Letters of Credit Outstanding, Amount |  |  |  | 130,000 |  |  |
FifthAmendmen |  |  |  |  |  |  |
Debt Instrument, Maturity Date | Jun. 30, 2020 |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |
Credit facility maximum borrowing |  |  |  | $ 46,000,000 |  | 36,000,000 |
Revolving Credit Facility | Eurodollar |  |  |  |  |  |  |
Fixed charge coverage ratio percentage |  | 2.25% |  |  |  |  |
Minimum |  |  |  |  |  |  |
Fixed charge coverage ratio |  |  | 1.00 | 1.00 |  |  |
Minimum | FifthAmendmen |  |  |  |  |  |  |
Credit facility maximum borrowing | $ 40,000,000 |  |  |  |  |  |
Minimum | Revolving Credit Facility | FifthAmendmen |  |  |  |  |  |  |
Credit facility maximum borrowing | 36,000,000 |  |  |  |  |  |
Maximum |  |  |  |  |  |  |
Fixed charge coverage ratio |  |  | 1.10 | 1.10 |  |  |
Maximum | FifthAmendmen |  |  |  |  |  |  |
Credit facility maximum borrowing | 50,000,000 |  |  |  |  |  |
Maximum | Revolving Credit Facility | FifthAmendmen |  |  |  |  |  |  |
Credit facility maximum borrowing | $ 46,000,000 |  |  |  |  |  |
Mortgage Note |  |  |  |  |  |  |
Debt Instrument, Maturity Date |  |  |  | Jun. 30, 2020 |  |  |
Vehicle and Equipment Loans | Minimum |  |  |  |  |  |  |
Credit facility effective rate of interest |  |  |  | 0.00% |  |  |
Vehicle and Equipment Loans | Maximum |  |  |  |  |  |  |
Credit facility effective rate of interest |  |  |  | 6.70% |  |  |
Term Loan |  |  |  |  |  |  |
Credit facility maximum borrowing |  |  |  |  |  | $ 4,000,000 |
Interest rate description under PNC facility |  |  |  | Interest charges with respect to loans are computed on the actual principal amount of loans outstanding during the month at a rate per annum equal to (A) with respect to Domestic Rate Loans (as defined in the PNC Facility), the sum of the Alternate Base Rate (as defined in the PNC Facility) plus one half of one percent (.50%) and (B) with respect to Eurodollar Rate Loans, the sum of the Eurodollar Rate plus two and one quarter of one percent (2.25%). |  |  |
Term Loan | Eurodollar |  |  |  |  |  |  |
Fixed charge coverage ratio percentage |  | 2.25% |  |  |  |  |
Term Loan | Revolving Credit Facility | Base Rate |  |  |  |  |  |  |
Fixed charge coverage ratio percentage |  | 0.50% |  |  |  |  |
Busey Bank |  |  |  |  |  |  |
Principal balance of this mortgage note |  |  |  | $ 93,000 |  |  |
Busey Bank | Mortgage Note |  |  |  |  |  |  |
Credit facility maximum borrowing |  |  |  |  |  |  | $ 855,000
Credit facility effective rate of interest |  |  |  |  |  |  | 4.00%
Line of Credit Facility, Expiration Date |  |  |  | Jun. 01, 2017 |  |  |

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- Definition Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6455314&loc=d3e45014-112735 + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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