Note 1 - Organization and Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

Revenues By Product Line [Table Text Block]

	Year Ended December 31,
(In thousands, except percentages)	2021⁽¹⁾		2020⁽²⁾		2019⁽³⁾
Product revenue
Freezer and thaw	$	56,620	$	13,548	$	3,312
Cell processing		44,965		30,946		23,367
Storage and cold chain services		328		46		165
Service revenue
Storage and cold chain services		9,817		1,752		-
Rental revenue
Storage and cold chain services		7,426		1,795		527
Total revenue	$	119,156	$	48,087	$	27,371

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block]

	Year Ending December 31,
(In thousands)	2022		2023		2024		Total
Rental revenue	$	10,151	$	3,748	$	900	$	14,799
Service revenue	$	67	$	31	$	10	$	108

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	Year Ended December 31,
(In thousands, except share and earnings per share data)	2021			2020			2019
Basic earnings (loss) per common share Numerator:
Net (loss) income	$	(7,635	)	$	2,667		$	(1,657	)
Amount attributable to unvested restricted shares		-			(135	)		-
Amount attributable to warrants outstanding		-			(82	)		-
Net (loss) income allocated to common shareholders		(7,635	)		2,450			(1,657	)
Denominator:
Weighted-average common shares issued and outstanding		38,503,944			27,306,258			19,460,299
Basic (loss) earnings per common share	$	(0.20	)	$	0.09		$	(0.09	)
Diluted earnings (loss) per common share Numerator:
Net (loss) income	$	(7,635	)	$	2,667		$	(1,657	)
Amount attributable to warrants		-			(20	)		-
Less: gain related to change in fair value of warrants		-			(3,601	)		-
Diluted (loss) earnings per common share		(7,635	)		(954	)		(1,657	)
Denominator:
Weighted-average common shares issued and outstanding		38,503,944			27,306,258			19,460,299
Diluted (loss) earnings per common share	$	(0.20	)	$	(0.03	)	$	(0.09	)

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

	Year Ended December 31,
	2021		2020		2019
Stock options and restricted stock awards		1,637,745		2,131,794		2,564,456
Warrants		18,204		1,499,953		2,956,039
Total		1,655,949		3,631,747		5,520,495

Schedule of Cash and Cash Equivalents [Table Text Block]

	Year Ended December 31,
(In thousands)	2021		2020		2019
Cash and cash equivalents	$	69,860	$	90,403	$	6,448
Restricted cash		10		53		-
Total cash, cash equivalents, and restricted cash	$	69,870	$	90,456	$	6,448

Revenue from External Customers by Products and Services [Table Text Block]

	Year Ended December 31,
Revenue by customers’ geographic locations	2021			2020			2019
United States		78	%		73	%		69	%
Canada		7	%		13	%		16	%
Germany		4	%		4	%		3	%
Europe, Middle East, Africa (excluding Germany)		10	%		8	%		11	%
Other		1	%		2	%		1	%
Total revenue		100	%		100	%		100	%

(In thousands)	2021		2020
United States	$	40,708	$	30,389
Netherlands		5,903		-
Total	$	46,611	$	30,389

Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]

	2020			2019
Risk free interest rate		0.1	%		1.9	%
Expected dividend yield		0.0	%		0.0	%
Contractual remaining lives		0.2			1.7
Expected volatility		56.8	%		70.3	%