Stock-Based Compensation (Details) - $ / shares	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Number of Shares, Balance available, beginning of period	340,760	541,319
Additional shares approved by stockholders	1,000,000	0
Number of Shares, Deferred under non-employee director's deferral program	(14,331)	(14,336)
Number of Shares, Balance available, end of period	1,085,097	340,760
Weighted Average Fair Value at Grant Date, Balance available, beginning of period	$ 0	$ 0
Weighted Average Fair Value at Grant Date, Additional shares approved by stockholders	0	0
Weighted Average Fair Value at Grant Date, Deferred under non-employee director's deferral program	4.00	6.73
Weighted Average Fair Value at Grant Date, Balance available, end of period	$ 0	$ 0
Director [Member]
Number of Shares, Granted	(4,332)	(10,223)
Weighted Average Fair Value at Grant Date, Granted	$ 4.00	$ 6.78
Employees [Member]
Number of Shares, Granted	(237,000)	(176,000)
Weighted Average Fair Value at Grant Date, Granted	$ 4.30	$ 6.49