Note 10 - Revenues (Tables)

6 Months Ended

Jun. 30, 2022

Notes Tables

Disaggregation of Revenue [Table Text Block]

	Three Months Ended June 30,				Six Months Ended June 30,
(in thousands)	2022		2021		2022		2021
Instruments, equipment, software and accessories	$	27,765	$	27,992	$	55,303	$	53,819
Service, maintenance and warranty contracts		1,443		1,205		2,683		2,367
Total revenues	$	29,208	$	29,197	$	57,986	$	56,186

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

	Three Months Ended June 30,				Six Months Ended June 30,
(in thousands)	2022		2021		2022		2021
United States	$	14,075	$	13,151	$	26,314	$	24,328
Europe		7,194		8,026		15,017		16,615
Asia		5,618		5,695		12,351		11,233
Rest of the world		2,321		2,325		4,304		4,010
Total revenues	$	29,208	$	29,197	$	57,986	$	56,186

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

	June 30,		December 31,
(in thousands)	2022		2021
Service contracts	$	1,653	$	1,976
Customer advances		1,959		2,290
Total deferred revenue	$	3,612	$	4,266

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

	Six Months Ended June 30,
(in thousands)	2022			2021
Balance, beginning of period	$	136		$	227
Bad debt (credit) expense		107			(17	)
Charge-offs and other		(48	)		(65	)
Balance, end of period	$	195		$	145