Note 7 - Long-term Debt - Summary of Long-term Debt (Details) - USD ($) $ in Thousands		Dec. 31, 2019	Dec. 31, 2018
Long-term debt		$ 241,824	$ 221,223
Less current maturities		(67,637)	(63,908)
Long-term debt—net of current maturities		174,187	157,315
Line of Credit [Member]
Long-term debt	[1]	17,047	10,192
Secured Debt [Member]
Long-term debt	[2]	$ 224,777	$ 211,031

[1] Line of credit agreement with a bank provides for maximum borrowings of $60.0 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 1.25% (2.96% at December 31, 2019) and are secured by our trade accounts receivable. An “unused fee” of 0.25% is charged if average daily borrowings are less than $18.0 million in a given month. 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 2019. At December 31, 2019, outstanding advances on the line were approximately $17.4 million, including letters of credit totaling $0.4 million, with availability to borrow $42.6 million. At December 31, 2018, outstanding advances on the line were approximately $10.9 million, including letters of credit totaling $0.7 million.

[2] Equipment financings consist of installment obligations for revenue equipment purchases, payable in various monthly installments with various maturity dates through September 2026, at a weighted average interest rate of 3.65% as of December 31, 2019 and collateralized by revenue equipment.