Note 10 - Debt (Tables)

3 Months Ended

Mar. 31, 2023

Notes Tables

Convertible Debt [Table Text Block]

							Principal Outstanding as of
							March 31,		December 31,
Description	Fixed Conversion Rate		Interest Rate			Maturity Date	2023		2022
Convertible notes dated September 10, 2018	$	0.40		8.0	%	September 7, 2023	$	200	$	200
Convertible note dated September 19, 2018	$	0.57		8.0	%	September 19, 2023		425		425
Convertible notes dated February/March 2019	$	0.25		8.0	%	February 28, 2024 to March 13, 2024		750		750
Convertible notes dated June/July 2019	$	0.10		8.0	%	June 7, 2024 to July 15, 2024		295		295
Convertible notes dated July 18, 2019	$	0.08		7.5	%	July 18, 2024		700		700
Convertible notes dated September 13, 2019	$	0.10		8.0	%	September 13, 2024		50		50
Convertible notes dated January 8, 2020	$	0.13		8.0	%	January 8, 2025 1		450		450
Convertible notes dated May-August 2022	$	0.13		8.0	%	May 10, 2027 to August 3, 2027		1,468		1,668
Convertible notes dated January 11, 2023	$	0.16		9.0	%	January 11, 2028 1		500		-
Convertible notes dated January 13, 2023	$	0.16		9.0	%	January 13, 2028		200		-
Total principal balance								5,038		4,538
Less current portion								1,375		625
							$	3,663	$	3,913

Unsecured Debt [Member]

Notes Tables

Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]

	Three Months Ended March 31, 2023		Year Ended December 31, 2022
Unsecured contingent payment obligations, beginning of period	$	5,089	$	5,691
Change in fair value		1,456		(602	)
Unsecured contingent payment obligations, end of period	$	6,545	$	5,089

Secured Debt [Member]

Notes Tables

Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]

	Three Months Ended March 31, 2023			Year Ended December 31, 2022
Secured contingent payment obligation, beginning of period	$	40,708		$	37,372
Change in fair value		(1,805	)		3,336
Secured contingent payment obligation, end of period	$	38,903		$	40,708