Note 7 - Debt - Current and Long-term Debt (Details) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Borrowings under Credit Facility
Borrowings under Credit Facility	12,185,000	3,002,000
Long-term debt, current	24,947,000	39,395,000
Long-term debt, noncurrent	168,676,000	196,057,000
Deferred loan costs	(263,000)	(250,000)
Deferred loan costs	(256,000)	(456,000)
Principal portion of capital lease obligations, secured by related revenue equipment	2,441,000	4,031,000
Capital lease obligations, long-term	19,761,000	10,547,000
Total debt and capital lease obligations	27,388,000	43,426,000
Total debt and capital lease obligations	188,437,000	206,604,000
Revenue Equipment Installment Notes [Member]
Long-term debt, current	23,986,000	38,461,000
Long-term debt, noncurrent	127,840,000	163,387,000
Real Estate Note [Member]
Long-term debt, current	1,224,000	1,184,000
Long-term debt, noncurrent	$ 28,907,000	$ 30,124,000