Quarterly report pursuant to Section 13 or 15(d)

Note 6 - Note Payable (Details Textual)

v3.19.1
Note 6 - Note Payable (Details Textual) - USD ($)
3 Months Ended
May 22, 2017
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Interest Payable   $ 15,135,000    
Notes Payable, Noncurrent, Total   $ 30,927,000   $ 30,528,000
Class of Warrant or Right, Number of Securities Called by Warrants or Rights   642,622    
May 2017 Issuance Related to 2017 Loan Agreement [Member]        
Warrants and Rights Outstanding, Term 10 years      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 222,049 222,049    
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 9.50 $ 9.50    
The 2017 Loan Agreement [Member] | CRG LP [Member]        
Debt Instrument, Face Amount $ 20,000,000      
Debt Agreement, Covenant, Additional Funding 10,000,000      
Debt Agreement, Maximum Borrowing Capacity $ 30,000,000      
Debt Instrument, Term 6 years      
Debt instrument, Interest Only Payment, Period 4 years      
Debt Instrument, Interest Rate, Stated Percentage 12.50%      
Debt Instrument, Interest Rate, Stated Percentage Deferred During Interest-only Period 4.00%      
Paid-in-Kind Interest   $ 318,000 $ 305,000  
Debt Instrument, Prepayment Fee, Percentage 5.00%      
Debt Instrument, Prepayment Fee, Period of Term 5 years      
Debt Instrument, Covenant, Cash and Cash Equivalents $ 2,000,000      
Notes Payable, Noncurrent, Total   30,927,000   $ 30,528,000
The 2017 Loan Agreement [Member] | CRG LP [Member] | Other Noncurrent Liabilities [Member]        
Interest Payable   $ 573,000