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Note 8 - Notes Payable and Convertible Notes Payable (Tables)

3 Months Ended

Mar. 31, 2024

Notes Tables

Schedule of Long-Term Debt Instruments [Table Text Block]

		Stated				March 31,				December 31,
(in thousands, except interest rates)		Interest Rate				2024				2023
Notes payable
Advance Cecil, Inc. (commenced April 2019)			8.00	%		$	140			$	138
Maryland DHCD (commenced February 2019)			8.00	%			704				694
Maryland DHCD (commenced May 2022)			6.00	%			1,083				1,083
Avenue Venture Opportunities Fund, L.P. (commenced May 2021)			15.10	%			15,000				15,000
							16,927				16,915
Less unamortized discount and debt issuance costs							(120	)			(394	)
Less notes payable, current portion, net of unamortized discount and debt issuance costs							(14,987	)			(14,627	)
Total notes payable, net of current portion						$	1,820			$	1,894
Convertible notes payable
Avenue Venture Opportunities Fund, L.P. (commenced May 2021)			15.10	%		$	5,000			$	5,000
Maryland DHCD (commenced December 2022)			6.00	%			5,388				5,308
							10,388				10,308
Less unamortized discount and debt issuance costs							(81	)			(174	)
Less convertible notes payable, current portion, net of unamortized discount and debt issuance costs							(5,042	)			(4,876	)
Total convertible notes payable, net of current portion						$	5,265			$	5,258

Schedule of Maturities of Long-Term Debt [Table Text Block]

(in thousands)		2019 MD Loan				2019 Cecil Loan				2021 Avenue Loan				2022 MD Loan				2022 DHCD Loan
2024 (remainder)		$	—			$	—			$	20,000			$	—			$	—
2025			—				—				—				347				—
2026			—				—				—				369				—
2027			—				—				—				317				—
2028			—				—				—				—				5,000
2029			—				—				—				—				—
Thereafter			500				100				—				—				—
Total debt principal payments			500				100				20,000				1,033				5,000
Accrued and unpaid interest			204				40				—				50				388
Less unamortized discount and debt issuance costs			—				—				(134	)			(20	)			(47	)
Future debt payments, net		$	704			$	140			$	19,866			$	1,063			$	5,341

X

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Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

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