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Note 3 - Revenue - Disaggregation of Revenue by Major Categories and Geographic Location (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Net sales	$ 102,110	$ 88,982	$ 284,152	$ 266,467
UNITED STATES
Net sales	68,726	63,292	195,823	188,312
Non-US [Member]
Net sales	33,384	25,690	88,329	78,155
Pumps and Pump Systems [Member]
Net sales	86,770	77,035	241,038	230,581
Repair Parts for Pumps and Pump Systems and Other [Member]
Net sales	$ 15,340	$ 11,947	$ 43,114	$ 35,886

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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