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Note 7 - Floor Plan Notes Payable and Lines of Credit (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Line of Credit Facility, Maximum Borrowing Capacity | $ 17,500,000 |
Floor Plan Notes Payable | 1,023,019,000 | $ 778,561,000
Long-term Line of Credit, Total | 0 |
Line of Credit Amount Pledged to Secure Letters of Credit | 11,600,000 |
Line of Credit Facility, Remaining Borrowing Capacity | $ 5,900,000 |
Floor Plan Credit Agreement [Member] |  |
Debt, Weighted Average Interest Rate | 1.90% | 1.40%
BMO Harris Bank N.A. [Member] |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 875,000,000 |
Debt Instrument, Working Capital Fee Percentage | 0.16% |
Floor Plan Notes Payable | $ 798,400,000 |
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] | Floor Plan Credit Agreement [Member] |  |
Debt Instrument, Interest Rate, Effective Percentage | 4.26% |
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] |  |
Floor Plan Notes Payable | $ 139,000,000 |
Debt Instrument, Variable Rate, Minimum Reference Rate | 7.00% |
Ford Motor Financing Agreement [Member] | Prime Rate [Member] |  |
Debt Instrument, Basis Spread on Variable Rate | 1.50% |
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, Total | 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 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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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