Stock-Based Compensation Assumptions used in the Black-Scholes pricing model (Tables)

12 Months Ended

Dec. 31, 2018

Stock option activity during the year [Abstract]

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

The Company uses the Black-Scholes option pricing model to estimate the fair value of each option on the date of grant. No options were granted during the years ended December 31, 2018 and December 31, 2017.