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Note 5 - Credit Facility (Details Textual) - USD ($)
Sep. 23, 2016
Sep. 30, 2016
Sep. 26, 2016
Dec. 31, 2015
MidCap Financial Services, LLC [Member] | Senior Credit Facility [Member]        
Long-term Line of Credit $ 23,000,000 $ 23,000,000 $ 23,000,000  
Debt Instrument, Basis Spread on Variable Rate 8.00%      
Debt Instrument, Final Payment Fee, Percentage 5.00%      
Line of Credit Facility, Interest Rate at Period End   8.50%    
Line of Credit Facility, Fair Value of Amount Outstanding   $ 2,000    
Long-term Line of Credit   $ 22,665,000