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Note 9 - Debt (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
Jul. 10, 2020
Jan. 10, 2020
Apr. 19, 2017
Apr. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Jan. 31, 2020
Dec. 31, 2019
Jun. 30, 2017
Gain (Loss) on Extinguishment of Debt, Total           $ (726)      
Gain (Loss) on Conversion of Notes to Common Stock         (543)   (543)      
Notes Payable, Other Payables [Member]                        
Long-term Debt, Total         1,287     1,287     $ 749  
Debt Instrument, Periodic Payment, Total             $ 100          
Notes Payable, Other Payables [Member] | Minimum [Member]                        
Debt Instrument, Interest Rate, Stated Percentage             4.00%          
Notes Payable, Other Payables [Member] | Maximum [Member]                        
Debt Instrument, Interest Rate, Stated Percentage             21.00%          
Convertible 2020 Notes [Member]                        
Debt Conversion, Original Debt, Amount $ 2,000                      
Debt Conversion, Converted Instrument, Shares Issued (in shares) 4,169,426                      
Gain (Loss) on Conversion of Notes to Common Stock $ (500)                      
Convertible 2020 Notes [Member] | Coupon Make Whole Payments [Member]                        
Debt Conversion, Original Debt, Amount $ 300                      
Convertible 2020 Notes [Member]                        
Debt Instrument, Interest Rate, Stated Percentage     12.00%                 12.00%
Debt Instrument, Interest Rate, Paid In Kind Percentage     2.00%                  
Debt Instrument, Convertible, Conversion Price (in dollars per share)     $ 14.72                  
Debt Instrument, Convertible, Conversion Ratio     0.0679                  
Long-term Debt, Total                     14,100  
Gain (Loss) on Extinguishment of Debt, Total               (700)        
Beneficial Ownership Limitation, Percentage     4.99%                  
Beneficial Ownership Limitation Percentage, Notice (Day)     61 days                  
Beneficial Ownership Limitation After Notice, Percentage     9.99%                  
Convertible 2020/21 Notes [Member]                        
Debt Instrument, Interest Rate, Stated Percentage   12.00%               12.00%    
Debt Instrument, Convertible, Conversion Price (in dollars per share)   $ 2.442                    
Debt Instrument, Convertible, Conversion Ratio   0.4095                    
Debt Instrument, Face Amount   $ 14,400                    
Maximum Principal Amount of Notes Issuable Upon Option Exercise   $ 7,100                    
Original Issue Discount   2.00%                    
Debt Instrument, Indenture, Maturity Extension, Trigger, Outstanding Balance   $ 7,000                    
Debt Instrument, PIK Interest   4.00%                    
Debt Instrument, Conversion Price Reduction, Discount Rate   10.00%                    
SBA Loans [Member]                        
Debt Instrument, Periodic Payment, Total       $ 60                
Proceeds from Paycheck Protection Program Under CARES Act       $ 1,000                
SBA Loans [Member] | Notes Payable, Other Payables [Member]                        
Long-term Debt, Total         $ 1,006     $ 1,006