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Note 7 - Floor Plan Notes Payable and Lines of Credit (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Assets Pledged As Collateral [Table Text Block]
   
December 31,
 
   
2017
   
2016
 
Inventories, new and used vehicles at cost based on specific identification, net of allowance
  $
818,066
    $
642,205
 
Vehicle sale related accounts receivable
   
104,778
     
83,482
 
                 
Total
  $
922,844
    $
725,687
 
                 
Floor plan notes payable related to vehicles
  $
778,561
    $
646,945