Consolidated Statements of Cash Flows (Unaudited) (Parentheticals) - shares	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Common Stock Offering 1 [Member]
Net proceeds from the common stock offering, shares issued (in shares)		3,680,000
Common Stock Offering 2 [Member]
Net proceeds from the common stock offering, shares issued (in shares)	1,215,000