Note 2 - Summary of Significant Accounting Policies (Details Textual)	3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 30, 2022 USD ($) $ / shares shares	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Sep. 30, 2021 USD ($) shares	Sep. 30, 2022 USD ($) $ / shares shares	Sep. 30, 2021 USD ($) shares	Dec. 31, 2021 USD ($) shares	Mar. 14, 2022 shares	Jan. 31, 2021 shares
Number of Financial Institutions	1				1
Accounts Receivable, Allowance for Credit Loss, Writeoff	$ 2,000			$ 115,000	$ 60,000	$ 179,000
Revenue from Contract with Customer, Excluding Assessed Tax	1,684,000			1,616,000	5,120,000	4,720,000
Contract with Customer, Asset, after Allowance for Credit Loss, Total	0				0		$ 0
Contract with Customer, Liability, Total	7,000				7,000		7,000
Capitalized Contract Cost, Net, Total	60,000				60,000		$ 84,000
Capitalized Contract Cost, Amortization	24,000			13,000	61,000	47,000
Capitalized Contract Cost, Impairment Loss					0
Equity Method Investment, Other than Temporary Impairment	$ (0)			$ (0)	$ 455,000	$ (0)
Series B Preferred Stock [Member]
Preferred Stock, Shares Outstanding, Ending Balance (in shares) | shares	44,413			39,279	44,413	39,279	40,504
Convertible Preferred Stock, Shares Issued upon Conversion (in shares) | shares	2,902,810			2,567,255	2,902,810	2,567,255	2,647,320
Series B Preferred Stock [Member] | Conversion From Series B Preferred Stock to Common Stock [Member]
Preferred Stock, Convertible, Conversion Ratio	65.36				65.36
Preferred Stock, Liquidation Preference Per Share (in dollars per share) | $ / shares	$ 1,000				$ 1,000
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares	$ 15.30				$ 15.30
Series C Preferred Stock [Member]
Preferred Stock, Shares Outstanding, Ending Balance (in shares) | shares	0				0		0	0	0
Convertible Preferred Stock, Shares Issued upon Conversion (in shares) | shares	1				1
InControl Medical [Member]
Equity Method Investment, Other than Temporary Impairment	$ 0	$ 455,000	$ 0				$ 0
Rental [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	265,000			$ 261,000	$ 799,000	$ 950,000
Contract with Customer, Liability, Current	412,000				412,000		$ 452,000
Contract with Customer, Liability, Revenue Recognized	$ 73,000			$ 14,000	$ 388,000	$ 310,000
Minimum [Member]
Warranty Period (Year)					1 year
Minimum [Member] | Viveve Systems [Member]
Lessor, Operating Lease, Term of Contract (Month)	6 months				6 months
Maximum [Member]
Warranty Period (Year)					3 years
Maximum [Member] | Viveve Systems [Member]
Lessor, Operating Lease, Term of Contract (Month)	12 months				12 months
Customer Concentration Risk [Member] | Revenue Benchmark [Member]
Concentration Risk, Number of Customers	2			1	1	1	1
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Two Customers [Member]
Concentration Risk, Percentage	36.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | One Customer [Member]
Concentration Risk, Percentage	31.00%			36.00%		29.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member]
Concentration Risk, Number of Customers					2
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Two Customers [Member]
Concentration Risk, Percentage					45.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member]
Concentration Risk, Percentage							10.00%