Stock Options and Warrants - Stock Option Plan Activity Rollforward (Details) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Number of Options
Balance at the beginning of the period (in shares)	635,000	595,125
Granted (in shares)	415,000	60,000
Expired (in shares)	(385,000)	(20,125)
Balance at the end of the period (in shares)	665,000	635,000
Exercisable at the end of the period (in shares)	278,750
Weighted Average Exercise Price
Balance at the beginning of the period (in dollars per share)	$ 3.39	$ 3.41
Granted (in dollars per share)	3.34	2.75
Expired (in dollars per share)	3.50	3.42
Balance at the end of the period (in dollars per share)	3.34	3.39
Exercisable at the end of the period (in dollars per share)	3.36
Minimum
Weighted Average Exercise Price
Balance at the beginning of the period (in dollars per share)	2.75	2.00
Expired (in dollars per share)		2.00
Balance at the end of the period (in dollars per share)	2.59	2.75
Exercisable at the end of the period (in dollars per share)	2.59
Maximum
Weighted Average Exercise Price
Balance at the beginning of the period (in dollars per share)	3.50	4.10
Expired (in dollars per share)	3.50	4.10
Balance at the end of the period (in dollars per share)	3.50	$ 3.50
Exercisable at the end of the period (in dollars per share)	$ 3.50