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Note 2 - Summary of Significant Accounting Policies (Details Textual)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jan. 01, 2019
USD ($)
Cash Equivalents, at Carrying Value, Total $ 18,399 $ 15,187  
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Total 0 0  
Accounts Receivable, before Allowance for Credit Loss, Current 311 120  
Accounts Receivable, Allowance for Credit Loss, Current 8 0  
Impairment of Long-Lived Assets Held-for-use 1,676 0  
Advertising Expense 68 125  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total 0 0  
Interest Paid, Including Capitalized Interest, Operating and Investing Activities, Total $ 0 0  
Fair Value Adjustment of Warrants    
Warrant [Member]      
Derivative Liability, Total    
Accounting Standards Update 2017-11 [Member] | Warrant [Member]      
Derivative Liability, Total     $ (2,192)
Fair Value Adjustment of Warrants   (1,267)  
Additional Paid-in Capital [Member] | Accounting Standards Update 2017-11 [Member]      
Cumulative Effect of New Accounting Principle in Period of Adoption     6,970
Retained Earnings [Member] | Accounting Standards Update 2017-11 [Member]      
Cumulative Effect of New Accounting Principle in Period of Adoption     $ (4,778)
Minimum [Member]      
Property, Plant and Equipment, Useful Life 1 year    
Finite-Lived Intangible Asset, Useful Life 10 years    
Maximum [Member]      
Property, Plant and Equipment, Useful Life 5 years    
Finite-Lived Intangible Asset, Useful Life 17 years    
Customer Concentration Risk [Member] | Three Major Customers [Member]      
Accounts Receivable, before Allowance for Credit Loss, Current   $ 108  
Customer Concentration Risk [Member] | Accounts Receivable [Member]      
Concentration Risk, Number of Major Customers 2 3  
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Two Major Customers [Member]      
Concentration Risk, Percentage 90.00%    
Accounts Receivable, before Allowance for Credit Loss, Current $ 280    
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Three Major Customers [Member]      
Concentration Risk, Percentage   90.00%  
Customer Concentration Risk [Member] | Revenue from Contract with Customer Benchmark [Member]      
Concentration Risk, Number of Major Customers 5 3  
Customer Concentration Risk [Member] | Revenue from Contract with Customer Benchmark [Member] | Three Major Customers [Member]      
Concentration Risk, Percentage   66.00%  
Customer Concentration Risk [Member] | Revenue from Contract with Customer Benchmark [Member] | Five Major Customers [Member]      
Concentration Risk, Percentage 83.00%