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Revolving Credit Facility (Details) - Revolving credit agreement - USD ($) |  | 6 Months Ended |
--- | --- | --- | ---
Jul. 11, 2017 | Jun. 30, 2017 | Dec. 31, 2016
Wells Fargo Credit Agreement |  |  |
Long-term debt |  |  |
Maximum borrowing capacity |  | $ 25,000,000 |
Annual commitment fee |  | 0.25% |
Long-term debt less current installments |  | $ 12,000,000 | $ 9,900,000
Bank of America Credit Agreement | Subsequent Event |  |  |
Long-term debt |  |  |
Maximum borrowing capacity | $ 25,000,000.0 |  |
Margin on variable rate | 1.25% |  |
Annual commitment fee | 0.20% |  |
LIBOR | Wells Fargo Credit Agreement |  |  |
Long-term debt |  |  |
Margin on variable rate |  | 1.25% |
Effective interest rate |  | 2.50% | 2.13%

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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the 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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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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- Definition Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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