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Note 6 - Long-term Debt - Summary of Long-term Debt (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Line of credit with a bank—due July 1, 2019, and collateralized by accounts receivable (1) |  | $ 172,636 | $ 167,197
Less current maturities |  | (73,641) | (42,806)
Long-term debt—net of current maturities |  | 98,995 | 124,391
Line of Credit [Member] |  |  |
Line of credit with a bank—due July 1, 2019, and collateralized by accounts receivable (1) | [1] |  | 1,866
Secured Debt [Member] |  |  |
Line of credit with a bank—due July 1, 2019, and collateralized by accounts receivable (1) | [2] | $ 172,636 | $ 165,331
[1] | Line of credit agreement with a bank provides for maximum borrowings of $40.0 million and contains certain restrictive covenants that must be maintained by the Company on a consolidated basis. Borrowings on the line of credit are at an interest rate of LIBOR as of the first day of the month plus 1.50% (2.86% at December 31, 2017) and are secured by our trade accounts receivable. Monthly payments of interest are required under this agreement. Also, under the terms of the agreement the Company must maintain a debt to EBITDA (earnings before interest, taxes, depreciation, and amortization) ratio of less than 4.00:1. The Company was in compliance with all provisions under this agreement throughout 2017. At December 31, 2017, outstanding advances on the line were approximately $0.7 million, consisting entirely of letters of credit totaling $0.7 million, with availability to borrow $39.3 million.
[2] | Equipment financings consist of installment obligations for revenue equipment purchases, payable in various monthly installments with various maturity dates through December 2022, at a weighted average interest rate of 2.52% as of December 31, 2017 and collateralized by revenue equipment.

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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. 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 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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://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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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. 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 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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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