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Note 3 - Revenue (Tables) | 12 Months Ended
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Dec. 31, 2019
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | Product Category |
|  | 2019 |  |  | 2018 |  |  | 2017 |
Pumps and pump systems |  | $ | 341,304 |  |  | $ | 357,882 |  |  | $ | 322,201 |
Repair parts for pumps and pump systems and other |  |  | 56,875 |  |  |  | 56,452 |  |  |  | 57,188 |
Total net sales |  | $ | 398,179 |  |  | $ | 414,334 |  |  | $ | 379,389 |
|  | Geographic Location |
|  | 2019 |  |  | 2018 |  |  | 2017 |
United States |  | $ | 275,290 |  |  | $ | 271,820 |  |  | $ | 241,746 |
Foreign countries |  |  | 122,889 |  |  |  | 142,514 |  |  |  | 137,643 |
Total net sales |  | $ | 398,179 |  |  | $ | 414,334 |  |  | $ | 379,389 |
Contract with Customer, Asset and Liability [Table Text Block] |
|  | December 31, 201 9 |  |  | December 31, 201 8 |
Contract assets |  | $ | 393 |  |  | $ | 1,953 |
Contract liabilities |  |  | 4,911 |  |  |  | 5,232 |

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