Annual report pursuant to Section 13 and 15(d)

Note 2 - Summary of Significant Accounting Policies (Details Textual)

v3.20.4
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