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Note 3 - Revenue (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
Product Category |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Pumps and pump systems |  | $ | 300,906 |  |  | $ | 341,304 |  |  | $ | 357,882 |
Repair parts for pumps and pump systems and other |  |  | 48,061 |  |  |  | 56,875 |  |  |  | 56,452 |
Total net sales |  | $ | 348,967 |  |  | $ | 398,179 |  |  | $ | 414,334 |
Geographic Location |
|  | 2020 |  |  | 2019 |  |  | 2018 |
United States |  | $ | 246,913 |  |  | $ | 275,290 |  |  | $ | 271,820 |
Foreign countries |  |  | 102,054 |  |  |  | 122,889 |  |  |  | 142,514 |
Total net sales |  | $ | 348,967 |  |  | $ | 398,179 |  |  | $ | 414,334 |
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] |
|  | December 31, 2020 |  |  | December 31, 2019 |
Contract assets |  | $ | - |  |  | $ | 393 |
Contract liabilities |  |  | 8,004 |  |  |  | 4,911 |

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