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Note 3 - Revenue - Disaggregation of Revenue by Major Categories and Geographic Location (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Net sales | $ 398,179 | $ 414,334 | $ 379,389
UNITED STATES |  |  |
Net sales | 275,290 | 271,820 | 241,746
Non-US [Member] |  |  |
Net sales | 122,889 | 142,514 | 137,643
Pumps and Pump Systems [Member] |  |  |
Net sales | 341,304 | 357,882 | 322,201
Repair Parts for Pumps and Pump Systems and Other [Member] |  |  |
Net sales | $ 56,875 | $ 56,452 | $ 57,188

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- Definition Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 + Details
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- Details
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- Details
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- Details
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