M. Stockholders' Equity (Details Narrative) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Common stock shares authorized	45,000,000	45,000,000
Preferred Stock shares authorized	5,000,000	5,000,000
Warrants outstanding	$ 0	$ 0
Additional paid-in capital, short swing profits	$ 5
ATM Offering [Member]
Stock sold new, shares issued	1,900,000
Net proceeds from sale of stock	$ 38,600
Year Ended December 31, 2013 [Member]
Stock sold new, shares issued			3,600,000
Net proceeds from sale of stock			$ 31,500
Offering on March 19, 2014 [Member]
Stock sold new, shares issued		2,000,000
Net proceeds from sale of stock		$ 45,700