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Note 5 - Commitments and Contingencies (Details Textual)
a in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
Oct. 31, 2019
a
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Aug. 31, 2017
ft²
Operating Lease, Expense $ 100,000 $ 200,000          
Area of Real Estate Property | ft²             7,500
Security Deposit       $ 22,000 $ 22,000    
Letters of Credit Outstanding, Amount 22,000 22,000     22,000 $ 22,000  
Loans Pledged as Collateral $ 22,000 $ 22,000     $ 22,000 $ 22,000  
Subsequent Event [Member]              
Area of Real Estate Property | a     0