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Note 2 - Summary of Significant Accounting Policies (Details Textual)
shares in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Jun. 19, 2019
Jan. 30, 2018
Sep. 30, 2019
USD ($)
Sep. 30, 2018
Sep. 30, 2019
USD ($)
shares
Sep. 30, 2018
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Apr. 01, 2019
USD ($)
Jan. 01, 2019
USD ($)
Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax, Total     $ 0   $ 0   $ 0 $ 0    
Deferred Offering Costs             0 464,000    
Impairment of Long-Lived Assets Held-for-use             $ 0      
Warranty Period         1 year   1 year      
Foreign Currency Transaction Gain (Loss), before Tax, Total             $ (13,000) 11,000    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total             $ 0 $ 0    
Weighted Average Number of Shares, Common Stock Subject to Repurchase or Cancellation | shares         0   0 0    
Number of Reportable Segments             1      
Operating Lease, Right-of-Use Asset     5,192,000   $ 5,192,000     $ 6,000,000  
Operating Lease, Liability, Total     $ 5,192,000   $ 5,192,000       $ 6,000,000  
Accounting Standards Update 2016-02 [Member]                    
Operating Lease, Right-of-Use Asset                   $ 1,800,000
Operating Lease, Liability, Total                   1,800,000
Accounting Standards Update 2016-02 [Member] | Subsequent Event [Member]                    
Operating Lease, Right-of-Use Asset                   1,800,000
Operating Lease, Liability, Total                   $ 1,800,000
Minimum [Member]                    
Property, Plant and Equipment, Useful Life             3 years      
Maximum [Member]                    
Property, Plant and Equipment, Useful Life             5 years      
Customer Concentration Risk [Member] | Accounts Receivable [Member]                    
Number of Major Customers         0   0 0    
Customer Concentration Risk [Member] | Revenue Benchmark [Member]                    
Number of Major Customers     0 0 0 0 0 0    
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | UNITED STATES                    
Concentration Risk, Percentage     96.00% 94.00% 94.00% 94.00% 94.00% 95.00%    
Reverse Stock Split [Member]                    
Stockholders' Equity Note, Stock Split, Conversion Ratio 10 40