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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, 2020	Dec. 31, 2019	Dec. 31, 2018
Net sales	$ 348,967	$ 398,179	$ 414,334
UNITED STATES
Net sales	246,913	275,290	271,820
Non-US [Member]
Net sales	102,054	122,889	142,514
Pumps and Pump Systems [Member]
Net sales	300,906	341,304	357,882
Repair Parts for Pumps and Pump Systems and Other [Member]
Net sales	$ 48,061	$ 56,875	$ 56,452

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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