1. Summary of Significant Accounting Policies (Details - Cash and cash equivalents and short and long-term investments) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash and cash equivalents:
Cash deposits	$ 16,015	$ 14,572
Money market funds	12,331	6,203
Total cash and cash equivalents	28,346	20,775	$ 28,559	$ 7,999
Short-term investments:
Corporate bonds (held-to-maturity)	44	3,084
Total short-term investments	44	3,084
Long-term investments:
Equity securities (available for sale)	4,311	3,332
Total long term investments	9,866	21,760
Total cash, cash equivalents and short and long-term investments	38,256	45,619
Corporate Bond Securities [Member]
Long-term investments:
Held-to-maturity	5,555	10,028
US government agency bonds
Long-term investments:
Held-to-maturity	$ 0	$ 8,400