1. Summary of Significant Accounting Policies (Details Narrative) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Accounting Policies [Abstract]
Warrants outstanding	2,000,000		2,000,000
Stock based compensation costs	$ 1,200	$ 1,300	$ 2,153	$ 2,622
Unrecognized stock-based compensation costs	4,800		$ 4,800
Unrecognized stock-based compensation costs amortization period			2 years 2 months 12 days
Aggregate intrinsic value outstanding	10,200		$ 10,200
Aggregate intrinsic value exercisable	$ 8,700		$ 8,700
Options Exercised			312,000	429,300
Total intrinsic value of options exercised			$ 860	$ 1,300
Shares available for future grants	893,000		893,000