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Note 10 - Revenues (Tables)

9 Months Ended

Sep. 30, 2022

Notes Tables

Disaggregation of Revenue [Table Text Block]

		Three Months Ended September 30,								Nine Months Ended September 30,
(in thousands)		2022				2021				2022				2021
Instruments, equipment, software and accessories		$	25,705			$	28,485			$	81,008			$	82,304
Service, maintenance and warranty contracts			1,217				1,178				3,900				3,545
Total revenues		$	26,922			$	29,663			$	84,908			$	85,849

Revenue from External Customers by Geographic Areas [Table Text Block]

		Three Months Ended September 30,								Nine Months Ended September 30,
(in thousands)		2022				2021				2022				2021
United States		$	11,511			$	12,709			$	38,278			$	37,300
Europe			7,344				8,366				22,361				25,569
Asia			6,730				7,161				19,080				18,588
Rest of the world			1,337				1,427				5,189				4,392
Total revenues		$	26,922			$	29,663			$	84,908			$	85,849

Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block]

		September 30,				December 31,
(in thousands)		2022				2021
Service contracts		$	1,642			$	1,976
Customer advances			2,000				2,290
Total deferred revenue		$	3,642			$	4,266

Financing Receivable, Allowance for Credit Loss [Table Text Block]

		Nine Months Ended September 30,
(in thousands)		2022				2021
Balance, beginning of period		$	136			$	227
Bad debt expense (credit)			103				(13	)
Charge-offs and other			(60	)			(76	)
Balance, end of period		$	179			$	138

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