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Note 7 - Leases - Supplemental Cash Flow Information Related to Leases (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Jan. 01, 2019
Dec. 31, 2018
Rent expense $ 147 $ 230 $ 510 $ 703    
Operating cash flows from operating leases     504      
Operating leases          
Operating Lease, Right-of-Use Asset 2,547   2,547   $ 2,966
Current portion of operating lease liabilities, included in accrued liabilities 556   556      
Operating lease liabilities, net of current portion 2,129   2,129    
Total operating lease liabilities $ 2,685   $ 2,685   $ 3,101  
Weighted average remaining lease term for operating leases (in years) (Year) 4 years 219 days   4 years 219 days      
Weighted average discount rate for operating leases 6.10%   6.10%