Consolidated Statements of Cash Flows (Parentheticals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Interest expense, capitalized amount	$ 14	$ 10	$ 24
Capital lease obligations for property and equipment	32	248	5
Non-cash stock options exercised	$ 406	$ 900	$ 150