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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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Net sales	$ 85,814	$ 108,330	$ 177,485	$ 205,189
UNITED STATES
Net sales	59,653	74,784	125,020	142,485
Non-US [Member]
Net sales	26,161	33,546	52,465	62,704
Pumps and Pump Systems [Member]
Net sales	75,356	92,167	153,654	174,688
Repair Parts for Pumps and Pump Systems and Other [Member]
Net sales	$ 10,458	$ 16,163	$ 23,831	$ 30,501

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.

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