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10. Fair Value measurements (Details-Finance receivables) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Finance Receivables Measured at Fair Value:        
Balance at beginning of period $ 316 $ 5,686 $ 1,664 $ 14,476
Payments on finance receivables at fair value (181) (3,057) (1,529) (10,930)
Charge-offs on finance receivables at fair value 0 (184) 0 (740)
Discount accretion 0 722 0 353
Mark to fair value 0 35 0 43
Balance at end of period 135 3,202 135 3,202
Debt Secured by Finance Receivables Measured at Fair Value:        
Balance at beginning of period 0 5,392 1,250 13,117
Principal payments on debt at fair value 0 (2,363) (1,250) (10,917)
Premium accretion 0 141 0 631
Mark to fair value 0 0 0 339
Balance at end of period 0 3,170 0 3,170
Reduction for principal payments collected and payable 0 (592) 0 (592)
Adjusted balance at end of period $ 0 $ 2,578 $ 0 $ 2,578