Cash and Cash Equivalents and Short-term Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Investments:
Available for sale common stock	$ 275	$ 199
Total available for sale	275	199
Total short term	275	199
Total short term	334	72
Financial institutions minimum net worth	1,000,000
Estimated Fair Value.
Investments:
Available for sale common stock	334	72
Total available for sale.	334	72
Total short term	334	72
Carrying Value.
Investments:
Available for sale common stock	334	72
Total available for sale.	334	72
Total short term	$ 334	$ 72