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Note 4 - Senior Credit Facility (Details Textual) - USD ($)
$ in Thousands
Sep. 23, 2016
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Long-term Line of Credit   $ 22,777  
MidCap Financial Services, LLC [Member] | Senior Credit Facility [Member]        
Long-term Line of Credit $ 23,000   $ 23,000  
Debt Instrument, Minimum LIBOR 0.50%      
Debt Instrument, Term 3 years 120 days      
Debt Instrument, Final Payment Fee, Percentage 5.00%      
Line of Credit Facility, Interest Rate at Period End     8.60%  
MidCap Financial Services, LLC [Member] | Senior Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument, Basis Spread on Variable Rate 8.00%