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Note 3 - Revenue - Disaggregation of Revenue by Major Categories and Geographic Location (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Net sales	$ 89,027	$ 91,671
UNITED STATES
Net sales	62,619	65,368
Non-US [Member]
Net sales	26,408	26,303
Pumps and Pump Systems [Member]
Net sales	75,301	78,299
Repair Parts for Pumps and Pump Systems and Other [Member]
Net sales	$ 13,726	$ 13,372

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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