Shareholders' Equity (Details 2) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Stock awards granted (in shares)	(72,115)	(54,036)
Restricted stock and restricted stock units granted (in shares)	(203,424)	(189,875)
Employee Stock Option [Member]
Balance at the beginning of the period (in shares)	501,622	477,534
Shares reserved (in shares)	0	0
Options granted for modification (in shares)	(61,814)
Stock awards granted (in shares)	(72,115)	(54,036)
Restricted stock and restricted stock units granted (in shares)	(203,424)	(189,875)
Stock options granted (in shares)	0	(20,000)
Stock options exercised (in shares)	0	0
Balance at the end of the period (in shares)	297,000	501,622
Balance at the beginning of the period (in shares)	419,162	895,161
Options granted for modification (in shares)	150,474
Stock options granted (in shares)	0	20,000
Stock options exercised (in shares)	0	(227,833)
Balance at the end of the period (in shares)	366,346	419,162
Balance at the beginning of the period (in dollars per share)	$ 3.18	$ 2.73
Stock options granted (in dollars per share)		2.90
Stock options exercised (in dollars per share)		1.72
Balance at the end of the period (in dollars per share)	$ 2.41	$ 3.18
Aggregate Intrinsic Value, Stock options exercised (in dollars)		$ 143,531
Employee Stock Option [Member] | Stock Option Plan2013 [Member]
Cancelled or forfeited (in shares)	103,349	237,500
Cancelled or forfeited (in shares)	(103,349)	(237,500)
Cancelled (in dollars per share)	$ 2.20	$ 2.86
Employee Stock Option [Member] | Incentive Stock Option Plan2003 [Member]
Cancelled or forfeited (in shares)	0	0
Cancelled or forfeited (in shares)	(99,941)	(30,666)
Cancelled (in dollars per share)	$ 2.20	$ 3.22
Restricted Stock and Restricted Stock Units [Member] | Stock Option Plan2013 [Member]
Cancelled or forfeited (in shares)	29,382	50,499
Cancelled, restricted stock units (in dollars per share)	$ 2.01	$ 2.72