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Note 18 - Related Party Transactions (Details Textual) - Majority Shareholder [Member] - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Revenue from Related Parties $ 4,834,000 $ 11,325,000 $ 13,253,000
Related Party Transaction, Expenses from Transactions with Related Party 8,837,000 4,834,000 1,440,000
Due from Related Parties 929,000 2,482,000  
Due to Related Parties 1,297,000 1,236,000  
Freight Transportation [Member]      
Accounts Receivable, Related Parties 925,000 2,370,000  
Maintenance Performed and Charges Paid to Third Parties on Behalf of Their Affiliate and Charged Back [Member]      
Accounts Receivable, Related Parties 4,000 5,000  
Property Lease Charges [Member]      
Accounts Receivable, Related Parties 0 106,000  
Insurance Premiums Paid in Excess of Amounts Earned [Member]      
Accounts Receivable, Related Parties 472,000 481,000  
Physical Damage Coverage [Member]      
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party 2,091,000 2,467,000 2,597,000
Auto Liability Coverage [Member]      
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party 11,030,000 9,605,000 9,464,000
General Liability Coverage [Member]      
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party 21,000 23,000 22,000
Workers Compensation Coverage [Member]      
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party $ 298,000 276,000 267,000
Trucks [Member]      
Proceeds from Sale of Productive Assets   $ 67,500 $ 750,000