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Note 5 - Senior Credit Facility (Details Textual) - USD ($)
$ in Thousands
Feb. 05, 2019
Jun. 30, 2019
Dec. 31, 2018
Sep. 23, 2016
Long-term Line of Credit, Total   $ 49,847 $ 25,372  
MidCap Financial Services, LLC [Member] | Senior Credit Facility [Member]        
Debt Instrument, Face Amount $ 100,000      
Debt Instrument, Minimum LIBOR 0.50%      
Debt Instrument, Term 2 years 180 days      
Line of Credit, Restricted Cash Required $ 25,000      
Long-term Line of Credit, Total   $ 50,000   $ 23,000
Line of Credit Facility, Interest Rate at Period End   10.40%    
MidCap Financial Services, LLC [Member] | Senior Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument, Basis Spread on Variable Rate 8.00%      
MidCap Financial Services, LLC [Member] | Senior Credit Facility [Member] | Secured Credit Facility, First Tranche [Member]        
Debt Instrument, Face Amount $ 50,000      
Repayments of Long-term Debt, Total 30,000      
MidCap Financial Services, LLC [Member] | Senior Credit Facility [Member] | Secured Credit Facility, Second Tranche [Member]        
Debt Instrument, Face Amount 30,000      
Line of Credit, Restricted Cash Required 40,000      
MidCap Financial Services, LLC [Member] | Senior Credit Facility [Member] | Secured Credit Facility, Third Tranche [Member]        
Debt Instrument, Face Amount $ 20,000