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Note 7 - Floor Plan Notes Payable and Lines of Credit (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Line of Credit Facility, Maximum Borrowing Capacity | $ 17,500,000 |
Floor Plan Notes Payable | $ 778,561,000 | $ 646,945,000
Debt, Weighted Average Interest Rate | 1.40% | 1.60%
Long-term Line of Credit | $ 0 |
Line of Credit Amount Pledged to Secure Letters of Credit | 11,900,000 |
Line of Credit Facility, Remaining Borrowing Capacity | 5,600,000 |
BMO Harris Bank N.A. [Member] |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 875,000,000 |
Debt Instrument, Interest Rate, Effective Percentage | 2.99% |
Debt Instrument, Working Capital Fee Percentage | 0.16% |
Floor Plan Notes Payable | $ 656,100,000 |
BMO Harris Bank N.A. [Member] | If Termination Occurs after January 1, 2018 and on or Prior to July 1, 2018 [Member] |  |
Debt Instrument, Prepayment Processing Fee, Percent | 1.00% |
BMO Harris Bank N.A. [Member] | IfTermination Occurs after July 1, 2018 and Prior to June 30, 2019 [Member] |  |
Debt Instrument, Prepayment Processing Fee Amount | $ 500,000 |
BMO Harris Bank N.A. [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |
Debt Instrument, Basis Spread on Variable Rate | 1.51% |
Ford Motor Financing Agreement [Member] |  |
Debt Instrument, Interest Rate, Effective Percentage | 5.25% |
Floor Plan Notes Payable | $ 82,000,000 |
Ford Motor Financing Agreement [Member] | Prime Rate [Member] |  |
Debt Instrument, Basis Spread on Variable Rate | 1.50% |
Debt Instrument, Variable Rate, Minimum Reference Rate | 3.75% |
Revolving Credit Facility [Member] | BMO Harris Bank N.A. [Member] |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 100,000,000 |
Long-term Line of Credit | 0 |
Letter of Credit [Member] | BMO Harris Bank N.A. [Member] |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 20,000,000 |

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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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