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Note 9 - Non-recourse Long-term Debt, Net (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Long-term Debt Instruments [Table Text Block]
   
December 31,
 
Condensed Consolidated Balance Sheets
 
2019
   
2018
 
Outstanding principal balance, current portion
  $
7,349
    $
5,688
 
Unamortized debt discount, current portion
   
(232
)    
(269
)
Current portion of debt, net
 
$
7,117
   
$
5,419
 
                 
Outstanding principal balance, long-term portion
  $
32,170
    $
39,674
 
Unamortized debt discount, long-term portion
   
(260
)    
(494
)
Long-term debt, net
 
$
31,910
   
$
39,180
 
   
December 31,
 
Condensed Consolidated Statements of Operations
 
2019
   
2018
 
Interest expense
  $
4,131
    $
4,660
 
Non-cash interest expense
   
271
     
302
 
Total interest expense included in interest (expense) income, net
 
$
4,402
   
$
4,962
 
Schedule of Maturities of Long-term Debt [Table Text Block]
2020
  $
7,349
 
2021
   
13,162
 
2022
   
19,008
 
Total payments
 
$
39,519