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Note 11 - Madryn Long-term Debt and Convertible Notes (Details Textual) - USD ($)		3 Months Ended
	Dec. 09, 2020	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Common Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.0001	$ 0.0001			$ 0.0001
Secured Subordinated Convertible Notes [Member] \| Madryn Noteholders [Member]
Debt Instrument, Face Amount	$ 26,700,000			$ 26.7
Debt Instrument, Default, Increase in Interest Rate	4.00%
Debt Instrument, Termination, Minimum Principal Outstanding	$ 10,000
Debt Instrument, Convertible, Conversion Price (in dollars per share)	$ 48.75
Interest Expense		$ 540,000	$ 534,000
Repayments of Long-term Debt, Total		$ 0
Debt Instrument, Maturity Date	Dec. 09, 2025
Secured Subordinated Convertible Notes [Member] \| Madryn Noteholders [Member] \| Original Issuance Of Notes To Third Anniversary Date [Member]
Debt Instrument, Interest Rate, Stated Percentage	8.00%
Secured Subordinated Convertible Notes [Member] \| Madryn Noteholders [Member] \| After the Third Anniversary [Member]
Debt Instrument, Interest Rate, Stated Percentage	6.00%
Madryn Credit Agreement [Member]
Repayments of Debt	$ 42,500,000