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Note 8 - Debt (Details Textual) - USD ($)
3 Months Ended
Mar. 13, 2020
Nov. 16, 2016
Sep. 30, 2016
Sep. 02, 2016
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Repayments of Long-term Debt, Principal         $ 85,913,459  
Gain (Loss) on Extinguishment of Debt, Total         (4,981,461)  
Warrants and Rights Outstanding         6,132,947   $ 6,116,882
Warrant Issued Alongside Entry Into the Loan Agreement [Member]              
Warrants and Rights Outstanding       $ 5,800,000      
Loan Agreement [Member] | Term Loan [Member] | OCM Strategic Credit SIGTEC Holdings, LLC [Member]              
Repayments of Long-term Debt Including Interest $ 87,200,000            
Repayments of Long-term Debt, Principal 80,000,000            
Repayments of Long-term Debt, Repayment Fee 4,000,000            
Interest Paid, Including Capitalized Interest, Operating and Investing Activities, Total 1,200,000            
Repayments of Long-term Debt, Prepayment Premium $ 1,900,000            
Gain (Loss) on Extinguishment of Debt, Total         $ (5,000,000)    
Proceeds from Issuance of Debt   $ 80,000,000          
Proceeds from Issuance of Debt, Placed in Escrow     $ 80,000,000        
Debt Instrument, Term (Year)       4 years      
Debt Instrument, Repayment Fee       $ 4,000,000      
Debt Issuance Costs, Gross       $ 8,200,000      
Loan Agreement [Member] | Term Loan [Member] | OCM Strategic Credit SIGTEC Holdings, LLC [Member] | London Interbank Offered Rate (LIBOR) [Member]              
Debt Instrument, Basis Spread on Variable Rate       11.50%      
Loan Agreement [Member] | Term Loan [Member] | OCM Strategic Credit SIGTEC Holdings, LLC [Member] | US Treasury (UST) Interest Rate [Member]              
Debt Instrument, Basis Spread on Variable Rate       0.50%