Warrants (Details) - Warrant [Member] - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Shares
Outstanding at beginning of year	7,195,997	7,428,141
Granted	550,000	0
Exercised	(142,856)	(232,144)
Forfeited/Expired	0	0
Outstanding at end of year	7,603,141	7,195,997
Exercisable at year end	7,603,141	7,195,997
Wtd. Avg. Exercise Price
Outstanding at beginning of year	$ 4.60	$ 4.49
Granted	1.75	0
Exercised	0.84	1.03
Forfeited/Expired	0	0
Outstanding at end of year	$ 4.46	$ 4.60