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Note 1 - Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Property, Plant and Equipment, Useful Lives [Table Text Block] |
Buildings |  |  | 20 | - | 50 years
Machinery and equipment |  |  | 5 | - | 15 years
Software |  |  | 3 | - | 5 years
Property, Plant and Equipment [Table Text Block] |
|  | 201 7 |  |  | 201 6 |
Land |  | $ | 4,187 |  |  | $ | 4,099 |
Buildings |  |  | 106,437 |  |  |  | 104,952 |
Machinery and equipment |  |  | 170,615 |  |  |  | 165,157 |
|  |  | 281,239 |  |  |  | 274,208 |
Less accumulated depreciation |  |  | (164,168 | ) |  |  | (152,141 | )
Property, plant and equipment, net |  | $ | 117,071 |  |  | $ | 122,067 |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
Technology and drawings |  |  | 13 | - | 20 years
Customer relationships |  |  | 9 | - | 15 years
Other intangibles |  |  | 2 | - | 18 years
Schedule of Product Warranty Liability [Table Text Block] |
|  | 201 7 |  |  | 201 6 |  |  | 201 5 |
Balance at beginning of year |  | $ | 1,435 |  |  | $ | 1,380 |  |  | $ | 1,166 |
Provision |  |  | 1,377 |  |  |  | 1,991 |  |  |  | 1,732 |
Claims |  |  | (1,714 | ) |  |  | (1,936 | ) |  |  | (1,518 | )
Balance at end of year |  | $ | 1,098 |  |  | $ | 1,435 |  |  | $ | 1,380 |

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