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Note 6 - Valuation Accounts - Valuation and Allowance Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Allowance for Trade Receivables [Member] |  |  |
Balance | $ 506 | $ 639 | $ 821
Net Charged to Costs and Expenses | 1,415 | 992 | 919
Net Write-Offs | (1,372) | (1,125) | (1,101)
Balance End of Year | 549 | 506 | 639
Allowance for Warranty Receivables From Manufacturers [Member] |  |  |
Balance | 105 | 140 | 419
Net Charged to Costs and Expenses | 833 | 1,677 | 411
Net Write-Offs | (824) | (1,712) | (690)
Balance End of Year | 114 | 105 | 140
Parts Inventory [Member] |  |  |
Balance | 7,291 | 5,067 | 4,416
Net Charged to Costs and Expenses | 3,400 | 4,215 | 2,547
Net Write-Offs | (5,806) | (1,991) | (1,896)
Balance End of Year | 4,885 | 7,291 | 5,067
Commercial Vehicle Inventory [Member] |  |  |
Balance | 6,541 | 10,644 | 7,395
Net Charged to Costs and Expenses | 9,623 | 8,417 | 7,877
Net Write-Offs | (11,062) | (12,520) | (4,628)
Balance End of Year | $ 5,102 | $ 6,541 | $ 10,644

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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Definition Amount of increase in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from charges to costs and expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Definition Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Details
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