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11. Fair Value measurements (Details-Finance receivables) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Mar. 31, 2014
Mar. 31, 2013
Finance Receivables Measured at Fair Value:            
Balance at beginning of period $ 5,686 $ 30,319 $ 14,476 $ 59,668 $ 9,058 $ 43,021
Payments on finance receivables at fair value (3,057) (8,848) (10,930) (36,828)    
Charge-offs on finance receivables at fair value (184) (535) (740) (2,275)    
Discount accretion 722 263 353 1,247    
Mark to fair value 35 18 43 (595)    
Balance at end of period 3,202 21,217 3,202 21,217 9,058 43,021
Balance at beginning of period 5,392 21,907 13,117 57,107 8,576 40,387
Principal payments on debt at fair value (2,363) (5,107) (10,917) (41,365)    
Premium accretion 141 379 631 2,079    
Mark to fair value 0 (291) 339 (933)    
Balance at end of period 3,170 16,888 3,170 16,888 8,576 40,387
Reduction for principal payments collected and payable (592) (570) (592) (570)    
Adjusted balance at end of period $ 2,578 $ 16,318 $ 2,578 $ 16,318