Note 7 - Debt (Details) - Current and Long-term Debt (Parentheticals)	Sep. 30, 2013	Dec. 31, 2012
Revenue Equipment Installment Notes [Member]
Note 7 - Debt (Details) - Current and Long-term Debt (Parentheticals) [Line Items]
Weighted average interest rate, current	4.50%	5.20%
Weighted average interest rate, long-term	4.50%	5.20%
Real Estate Note [Member]
Note 7 - Debt (Details) - Current and Long-term Debt (Parentheticals) [Line Items]
Weighted average interest rate, current	2.70%	2.70%
Weighted average interest rate, long-term	2.70%	2.70%
Other Note Payable [Member]
Note 7 - Debt (Details) - Current and Long-term Debt (Parentheticals) [Line Items]
Weighted average interest rate, current	3.00%	3.00%
Weighted average interest rate, long-term	3.00%	3.00%