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Note 8 - Loans Payable (Details Textual) - MidCap Agreement [Member] - MidCap Financial [Member] - USD ($)
$ in Millions
Nov. 06, 2018
Sep. 25, 2018
Oct. 04, 2016
Mar. 31, 2018
Debt Agreement, Maximum Borrowing Capacity     $ 40.0  
Debt Agreement, Maximum Borrowing Capacity, Including Additional Increase     60.0  
Payments for Loans $ 32.3      
Debt Instrument, Prepayment and Exit Fees 2.3 $ 2.3    
Gain (Loss) on Extinguishment of Debt, Total $ (2.1)      
Revolving Credit Facility [Member]        
Line of Credit Facility, Maximum Borrowing Capacity     $ 10.0  
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage     0.50%  
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member]        
Debt Instrument, Basis Spread on Variable Rate     4.45%  
Term Loan [Member]        
Long-term Debt, Total     $ 30.0 $ 30.0
Debt Instrument, Term     5 years  
Debt Instrument, Periodic Payment, Term     2 years  
Debt Instrument, Periodic Payment, Term, Potential Extension     4 years  
Debt Agreement, Additional Increase     $ 10.0  
Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument, Basis Spread on Variable Rate     7.60%