Note 11 - Commitments (Details Textual)	3 Months Ended
	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Advances on Inventory Purchases	$ 1,421,120	$ 1,371,548
Purchase Commitment for Devices [Member]
Purchase Commitment Number Of Units	2,000
Purchase Commitment, Remaining Minimum Amount Committed	$ 2,100,000	2,300,000
Advances on Inventory Purchases	1,100,000	1,300,000
Development of the Next Generation Instrument [Member]
Purchase Commitment, Remaining Minimum Amount Committed	98,000
Contracts for Funding of Future Epidural Instruments and Parts [Member]
Advances on Inventory Purchases	$ 165,000	$ 41,000