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Item 15 (Notes) | 12 Months Ended
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Dec. 31, 2019
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] | SCHEDULE II – VALUATION AND QUALIFYING ACCOUNTS (in thousands):
Classification |  | Balance at beginning of year |  | Additions (deductions) charged to expenses |  | Other Additions |  | (Deductions) |  | Balance at end of year
Allowance for doubtful accounts
2019 |  | $ | 46 |  |  | $ | — |  |  | $ | — |  |  | $ | (46 | ) |  | $ | — |
2018 |  | 73 |  |  | — |  |  | — |  |  | (27 | ) |  | 46 |
2017 |  | 87 |  |  | 133 |  |  | 27 |  |  | (174 | ) |  | 73 |
Warranty reserves
2019 |  | $ | 519 |  |  | $ | 74 |  |  | $ | — |  |  | $ | (40 | ) |  | $ | 553 |
2018 |  | 941 |  |  | (414 | ) |  | — |  |  | (8 | ) |  | 519 |
2017 |  | 860 |  |  | 492 |  |  | 122 |  |  | (533 | ) |  | 941 |
Valuation allowance for deferred tax assets
2019 |  | $ | 79,196 |  |  | $ | (1,239 | ) |  | $ | — |  |  | $ | — |  |  | $ | 77,957 |
2018 |  | 84,560 |  |  | (5,761 | ) |  | 397 |  |  | — |  |  | 79,196 |
2017 |  | 100,284 |  |  | (50,881 | ) |  | 35,157 |  |  | — |  |  | 84,560 |

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 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) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- References No definition available. + Details
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