Note 2 - Summary of Significant Accounting Policies - Calculation of Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2025	Sep. 30, 2024
Net Income (Loss) Attributable to Parent	$ (2,596)	$ (1,931)	$ (1,502)	$ (1,431)	$ (1,266)	$ (1,481)	$ (6,029)	$ (4,178)
Dividends on Series B Preferred Stock	(36)			0			(37)	0
Deemed dividends on warrants	(10)			0			(10)	0
Net loss attributed to Tivic Health Systems, Inc.	$ (2,642)			$ (1,431)			$ (6,076)	$ (4,178)
Basic and diluted weighted average number of shares outstanding (in shares)	1,320,778			364,184			928,971	229,291
Net loss per share - basic and diluted (in dollars per share)	$ (2)			$ (3.93)			$ (6.54)	$ (18.22)