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Note 3 - Revenue - Disaggregation of Revenue by Major Categories and Geographic Location (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net sales	$ 378,316	$ 348,967	$ 398,179
UNITED STATES
Net sales	260,683	246,913	275,290
Non-US [Member]
Net sales	117,633	102,054	122,889
Pumps and Pump Systems [Member]
Net sales	321,263	300,906	341,304
Repair Parts for Pumps and Pump Systems and Other [Member]
Net sales	$ 57,053	$ 48,061	$ 56,875

X

- 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

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