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Note 13 - Revenues (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

Disaggregation of Revenue [Table Text Block]

		Year Ended December 31,
(in thousands)		2020				2019
Instruments, equipment, software and accessories		$	97,473			$	110,220
Service, maintenance and warranty contracts			4,627				5,956
Total revenues		$	102,100			$	116,176

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

		Year Ended December 31, 2020
		Service				Customer
(in thousands)		Contracts				Advances				Total
Balance, beginning of period		$	1,587			$	2,362			$	3,949
Deferral of revenue			3,329				1,302				4,631
Recognition of deferred revenue			(3,298	)			(1,522	)			(4,820	)
Effect of foreign currency translation			11				-				11
Balance, end of period		$	1,629			$	2,142			$	3,771

		Year Ended December 31, 2019
		Service				Customer
(in thousands)		Contracts				Advances				Total
Balance, beginning of period		$	1,659			$	2,161			$	3,820
Deferral of revenue			2,152				1,095				3,247
Recognition of deferred revenue			(2,233	)			(894	)			(3,127	)
Effect of foreign currency translation			9				-				9
Balance, end of period		$	1,587			$	2,362			$	3,949

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

		Year Ended December 31,
(in thousands)		2020				2019
Balance, beginning of period		$	325			$	332
Bad debt expense			17				288
Charge-offs and other recoveries			(124	)			(293	)
Effect of foreign currency translation			9				(2	)
Balance, end of period		$	227			$	325

Schedule of Product Warranty Liability [Table Text Block]

		Beginning								(Charges)\				Ending
(in thousands)		Balance				Additions				Credits				Balance
Year ended December 31, 2019		$	391				10				(149	)		$	252
Year ended December 31, 2020		$	252				77				(143	)		$	186

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Tabular disclosure of allowance for credit loss on financing receivable.

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