Stockholders' Equity - Schedule of Stock Options Activity (Details) - Non-Qualified Stock Option [Member] - $ / shares	6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Options outstanding, beginning of year	279,167	531,667	531,667
Number of options, granted
Number of options, redeemed	(3,750)	(22,500)
Number of options, exercised	(5,000)	(7,500)
Number of options, expired / terminated		(5,000)
Number of options outstanding, end of year	270,417	496,667	279,167
Number of options exercisable, end of year	270,417	493,489
Weighted exercise price outstanding, beginning of year	$ 2.34	$ 1.80	$ 1.80
Weighted average exercise price, granted
Weighted average exercise price, redeemed	1.40	1.70
Weighted average exercise price, exercised	1.13	1.40
Weighted average exercise price, expired / terminated		1.40
Weighted average exercise price outstanding, end of quarter	2.38	1.82	$ 2.34
Weighted average exercise price exercisable, end of quarter	$ 2.38	$ 1.82