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Note 3 - Revenue - Disaggregation of Revenue by Major Categories and Geographic Location (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Net sales	$ 93,015	$ 85,814	$ 182,042	$ 177,485
UNITED STATES
Net sales	64,478	59,653	127,097	125,020
Non-US [Member]
Net sales	28,537	26,161	54,945	52,465
Pumps and Pump Systems [Member]
Net sales	78,935	75,356	154,236	153,654
Repair Parts for Pumps and Pump Systems and Other [Member]
Net sales	$ 14,080	$ 10,458	$ 27,806	$ 23,831

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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