1. Summary of Significant Accounting Policies (Details - Cash and cash equivalents and short and long-term investments) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash and cash equivalents:
Cash deposits	$ 10,724	$ 16,015
Money market funds	9,298	12,331
Total cash and cash equivalents	20,022	28,346	$ 20,775	$ 28,559
Short-term investments:
Certificates of deposit (held-to-maturity)	24,000	0
Corporate bonds (held-to-maturity)	80	44
Total short-term investments	24,080	44
Long-term investments:
Equity securities (available for sale)	4,945	4,311
Total long term investments	9,945	9,866
Total cash, cash equivalents and short and long-term investments	54,047	38,256
Corporate Bond Securities [Member]
Long-term investments:
Held-to-maturity	$ 5,000	$ 5,555