Note 7 - Debt (Details) - Current and Long-term Debt (Parentheticals)	Mar. 31, 2014	Dec. 31, 2013
Revenue Equipment Installment Notes [Member]
Note 7 - Debt (Details) - Current and Long-term Debt (Parentheticals) [Line Items]
Interest rate on notes payable, current	4.10%	4.70%
Interest rate on notes payable, long-term	4.10%	4.70%
Real Estate Note [Member]
Note 7 - Debt (Details) - Current and Long-term Debt (Parentheticals) [Line Items]
Interest rate on notes payable, current	2.40%	2.40%
Interest rate on notes payable, long-term	2.40%	2.40%
Other Note Payable [Member]
Note 7 - Debt (Details) - Current and Long-term Debt (Parentheticals) [Line Items]
Interest rate on notes payable, current	3.00%	3.00%
Interest rate on notes payable, long-term	3.00%	3.00%