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Stock-Based Compensation Plans (Tables)
12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of share-based compensation expense Stock compensation expense consisted of the following for the years ended December 31:
201820172016
Share-based compensation - employees$1,244,606 $1,032,094 $833,027 
Share-based compensation - nonemployees120,092 82,969 19,075 
Share-based compensation - foundation contribution$— $372,500 $— 
Total share-based compensation$1,364,698 $1,487,563 $852,102 
Schedule of stock options activity
Stock option activity for 2018 and 2017 was as follows:

Number of
shares
Weighted-average exercise price per share
Weighted-
average
remaining
contractual
term (years)
Aggregate
intrinsic
value
Outstanding, December 31, 20165,800 $13.00 1.9$— 
Options granted— — 
Options exercised— — 
Options forfeited or expired— — 
Outstanding, December 31, 20175,800 13.00 0.9— 
Options granted— — 
Options exercised— — 
Options forfeited or expired— — 
Outstanding, December 31, 20185,800 13.00 0.1— 
Exercisable at December 31, 20185,800 $13.00 0.1$— 
Schedule of stock options activity, additional disclosures Information related to the stock option plans during 2018, 2017 and 2016 was as follows:
201820172016
Intrinsic value of options exercised$— $— $— 
Weighted-average fair value of
options exercised
$— $— $— 
Schedule of restricted stock activity
Restricted stock activity was as follows:
Number
of shares
Weighted-
average
grant-date
fair value
Nonvested, December 31, 2016703,295 $5.13 
Shares granted238,550 6.48 
Shares vested(146,275)4.74 
Shares forfeited(27,725)5.34 
Nonvested, December 31, 2017767,845 5.61 
Shares granted261,680 6.66 
Shares vested(170,759)4.79 
Shares forfeited(25,025)6.19 
Nonvested, December 31, 2018833,741 $6.09