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Note 6 - Valuation Accounts (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Summary of Valuation Allowance [Table Text Block] |
|  | Balance Beginning of Year |  |  | Net Charged to Costs and Expenses |  |  | Net Write- Offs |  |  | Balance End of Year |
201 7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserve for accounts receivable |  | $ | 549 |  |  | $ | 625 |  |  | $ | (558 | ) |  | $ | 616 |
Reserve for warranty receivable s |  |  | 114 |  |  |  | 713 |  |  |  | (617 | ) |  |  | 210 |
Reserve for parts inventory |  |  | 4,885 |  |  |  | 1,414 |  |  |  | (69 | ) |  |  | 6,230 |
Reserve for commercial vehicle inventory |  |  | 5,102 |  |  |  | 5,997 |  |  |  | (5,146 | ) |  |  | 5,953 |
201 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserve for accounts receivable |  | $ | 506 |  |  | $ | 1,415 |  |  | $ | (1,372 | ) |  | $ | 549 |
Reserve for warranty receivable s |  |  | 105 |  |  |  | 833 |  |  |  | (824 | ) |  |  | 114 |
Reserve for parts inventory |  |  | 7,291 |  |  |  | 3,400 |  |  |  | (5,806 | ) |  |  | 4,885 |
Reserve for commercial vehicle inventory |  |  | 6,541 |  |  |  | 9,623 |  |  |  | (11,062 | ) |  |  | 5,102 |
2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserve for accounts receivable |  | $ | 639 |  |  | $ | 992 |  |  | $ | (1,125 | ) |  | $ | 506 |
Reserve for warranty receivable s |  |  | 140 |  |  |  | 1,677 |  |  |  | (1,712 | ) |  |  | 105 |
Reserve for parts inventory |  |  | 5,067 |  |  |  | 4,215 |  |  |  | (1,991 | ) |  |  | 7,291 |
Reserve for commercial vehicle inventory |  |  | 10,644 |  |  |  | 8,417 |  |  |  | (12,520 | ) |  |  | 6,541 |

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- Definition Tabular disclosure of valuation allowances to reduce deferred tax assets to net realizable value, including identification of the deferred tax asset more likely than not will not be fully realized and the corresponding amount of the valuation allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration