Note 12 - Revenue - Remaining Performance Obligations (Details)	Dec. 31, 2023 USD ($)
Revenue, Remaining Performance Obligation, Amount	$ 2,268,000
Service [Member]
Revenue, Remaining Performance Obligation, Amount	1,825,000
Device Revenue [Member]
Revenue, Remaining Performance Obligation, Amount	41,000	[1]
Exclusivity Fee [Member]
Revenue, Remaining Performance Obligation, Amount	267,000
Clinical Revenue [Member]
Revenue, Remaining Performance Obligation, Amount	$ 135,000

[1] Represents the minimum purchase requirements under the distribution agreement the Company signed with its AXP distributor in China and other revenue deferred at December 31, 2023.