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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Parts Inventory [Member] |  |  |
Balance | $ 9,315 | $ 7,661 | $ 7,050
Net Charged to Costs and Expenses | 3,520 | 4,501 | 4,460
Net Write-Offs | (5,375) | (2,847) | (3,849)
Balance End of Year | 7,460 | 9,315 | 7,661
Commercial Vehicle Inventory [Member] |  |  |
Balance | 6,075 | 9,602 | 4,587
Net Charged to Costs and Expenses | (536) | 9,598 | 12,489
Net Write-Offs | (4,620) | (13,125) | (7,474)
Balance End of Year | $ 919 | 6,075 | 9,602
SEC Schedule, 12-09, Allowance, Credit Loss [Member] |  |  |
Balance |  | 1,014 | 987
Net Charged to Costs and Expenses |  |  | 2,065
Net Write-Offs |  |  | (2,038)
Balance End of Year |  |  | 1,014
Allowance for Warranty Receivables From Manufacturers [Member] |  |  |
Balance |  | $ 410 | 429
Net Charged to Costs and Expenses |  |  | 1,661
Net Write-Offs |  |  | (1,680)
Balance End of Year |  |  | $ 410

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column B)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column E)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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Period Type: | instant

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- Definition Amount of increase in valuation and qualifying accounts and reserves from charge to cost and expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column C)(1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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- Definition Amount of decrease in valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column D)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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- Details
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- Details
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