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Note 11 - Revenues (Tables)

9 Months Ended

Sep. 30, 2021

Notes Tables

Disaggregation of Revenue [Table Text Block]

		Three Months Ended September 30,								Nine Months Ended September 30,
(in thousands)		2021				2020				2021				2020
Instruments, equipment, software and accessories		$	28,485			$	21,851			$	82,304			$	66,857
Service, maintenance and warranty contracts			1,178				2,186				3,545				4,259
Total revenues		$	29,663			$	24,037			$	85,849			$	71,116

Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]

		Three Months Ended September 30,								Nine Months Ended September 30,
(in thousands)		2021				2020				2021				2020
United States		$	12,709			$	11,110			$	37,300			$	30,381
Europe			8,366				6,777				25,569				20,617
Asia			7,161				4,240				18,588				14,180
Rest of the world			1,427				1,910				4,392				5,938
Total revenues		$	29,663			$	24,037			$	85,849			$	71,116

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

		September 30,				December 31,
(in thousands)		2021				2020
Service contracts		$	1,839			$	1,629
Customer advances			1,784				2,142
Total deferred revenue		$	3,623			$	3,771

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

		Nine Months Ended September 30,
(in thousands)		2021				2020
Balance, beginning of period		$	227			$	325
Bad debt (credit) expense			(13	)			24
Charge-offs and other			(71	)			(60	)
Effect of foreign currency translation			(5	)			4
Balance, end of period		$	138			$	293

X

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Tabular disclosure of allowance for credit loss on financing receivable.

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