Note 2 - Summary of Significant Accounting Policies (Details Textual)			12 Months Ended
	Dec. 01, 2020 USD ($) shares	Sep. 18, 2019 USD ($)	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 16, 2020 shares	Nov. 30, 2019 shares	Jan. 01, 2019 USD ($)
Common Stock, Shares Authorized (in shares) | shares			75,000,000	75,000,000
Reverse Stock Split, Rounding Adjustment (in shares) | shares	5,931
Payments for Fractional Shares of Reverse Stock Split	$ 0	$ 6,000
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares			$ 0.0001	$ 0.0001
Operating Lease, Right-of-Use Asset			$ 130,000	$ 395,000			$ 629,000
Number of Financial Institutions			1
Accounts Receivable, Allowance for Credit Loss, Ending Balance			$ 124,000	407,000
Accounts Receivable, Allowance for Credit Loss, Writeoff			736,000	905,000
Inventory, Finished Goods, Net of Reserves			2,818,000	4,051,000
Inventory, Raw Materials, Net of Reserves			436,000	810,000
Revenue from Contract with Customer, Excluding Assessed Tax, Total			5,479,000	6,567,000
Deferred Income			345,000	662,000
Contract with Customer, Asset, after Allowance for Credit Loss, Total			0	0
Contract with Customer, Liability, Total			17,000	108,000
Capitalized Contract Cost, Net, Total			132,000	486,000
Capitalized Contract Cost, Amortization			417,000	143,000
Capitalized Contract Cost, Impairment Loss			0
Equity Method Investment, Other than Temporary Impairment			$ 0	$ 0
Series A Preferred Stock [Member]
Convertible Preferred Stock, Shares Issued upon Conversion (in shares) | shares			1	1		1
Preferred Stock, Shares Outstanding, Ending Balance (in shares) | shares			0	185,218	0
Series B Preferred Stock [Member]
Convertible Preferred Stock, Shares Issued upon Conversion (in shares) | shares			2,341,111	270,458
Preferred Stock, Shares Outstanding, Ending Balance (in shares) | shares			35,819	31,678
Conversion of Stock Exchange Ratio			65.36
Preferred Stock, Liquidation Preference Per Share (in dollars per share) | $ / shares			$ 1,000
Conversion of Stock, Conversion Rate (in dollars per share) | $ / shares			$ 15.30
Rental [Member]
Revenue from Contract with Customer, Excluding Assessed Tax, Total			$ 1,337,000	$ 530,000
Rental Program Equipment [Member]
Revenue from Contract with Customer, Excluding Assessed Tax, Total			594,000
Marketing Programs [Member]
Contract with Customer, Liability, Total			$ 17,000	$ 108,000
Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)			3 years
Warranty Period (Year)			1 year
Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)			7 years
Warranty Period (Year)			3 years
Viveve Systems [Member]
Property, Plant and Equipment, Useful Life (Year)			5 years
Medical Equipment, Sales Demos [Member]
Property, Plant and Equipment, Useful Life (Year)			5 years
Customer Concentration Risk [Member] | Revenue Benchmark [Member]
Concentration Risk, Number of Customers			1	1
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | One Customer [Member]
Concentration Risk, Percentage			36.00%	16.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member]
Concentration Risk, Number of Customers			1	2
Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member]
Concentration Risk, Percentage			37.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Two Customers [Member]
Concentration Risk, Percentage				49.00%
Accrued Liabilities and Other Noncurrent Liabilities [Member]
Operating Lease, Liability, Total			$ 132,000	$ 400,000			$ 629,000
Reverse Stock Split [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio	10	100