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Note 8 - Loans Payable (Details Textual) - USD ($)
$ in Millions
Oct. 04, 2016
Jun. 30, 2018
Long-term Debt, Total   $ 30.0
MidCap Agreement [Member] | MidCap Financial [Member]    
Debt Agreement, Maximum Borrowing Capacity $ 40.0  
Debt Agreement, Maximum Borrowing Capacity, Including Additional Increase 60.0  
MidCap Agreement [Member] | MidCap Financial [Member] | Revolving Credit Facility [Member]    
Line of Credit Facility, Maximum Borrowing Capacity $ 10.0  
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.50%  
MidCap Agreement [Member] | MidCap Financial [Member] | London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member]    
Debt Instrument, Basis Spread on Variable Rate 4.45%  
MidCap Agreement [Member] | MidCap Financial [Member] | Term Loan [Member]    
Long-term Debt, Total $ 30.0 $ 30.0
Debt Instrument, Periodic Payment, Term 2 years  
Debt Instrument, Periodic Payment, Term, Potential Extension 4 years  
Line of Credit Facility, Maximum Borrowing Capacity $ 10.0  
Debt Agreement, Additional Increase $ 10.0  
MidCap Agreement [Member] | MidCap Financial [Member] | Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Debt Instrument, Basis Spread on Variable Rate 7.60%