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17. Parent Company Financial Statements (Details 1) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Selling, general and administrative expenses $ 2,805 $ 2,774 $ 3,148 $ 3,634 $ 3,332 $ 2,972 $ 3,449 $ 2,842 $ 12,361 $ 12,595
Operating income (loss) (1,478) (1,857) (1,303) (3,971) (997) 4,642 7,763 12,682 (8,609) 24,090
Other income (expense)                    
Interest expense (2,523) (2,610) (2,485) (2,546) (2,315) (2,287) (2,530) (2,920) (10,164) (10,052)
Other income (expense) (79) (30) (94) (67) 249 81 110 164 (270) 604
Income (loss) before income taxes (6,453) (5,755) (6,287) (8,637) (3,740) 464 2,722 7,693 (27,132) 7,139
Income tax expense 0 0 0 (6) 0 0 0 (6) (6) (6)
Other comprehensive loss                    
Foreign currency translation adjustment (67) (104) (84) 38 (56) (98) 0 108 (217) (46)
Comprehensive income (loss) $ (6,520) $ (5,859) $ (6,371) $ (8,605) $ (3,796) $ 366 $ 2,722 $ 7,795 (27,355) 7,087
Parent Company Financial Statements                    
Equity in subsidiary gains (losses)                 (22,669) 11,123
Selling, general and administrative expenses                 3,910 3,942
Operating income (loss)                 (26,579) 7,181
Other income (expense)                    
Interest expense                 (179) (277)
Other income (expense)                 (374) 235
Income (loss) before income taxes                 (27,132) 7,139
Income tax expense                 (6) (6)
Net income (loss)                 (27,138) 7,133
Other comprehensive loss                    
Foreign currency translation adjustment                 (217) (46)
Comprehensive income (loss)                 $ (27,355) $ 7,087