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Stock Options and Warrants (Tables)
 12 Months Ended
Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Fair Value Assumptions
The following table sets forth the weighted average assumptions used in applying the Black Sholes option pricing model to the option grants in 2014. No options were granted in 2016 and 2015:
 
2014
 
 
Weighted average fair value of options granted
$5.65
 

Expected dividend yield
—%
 

Expected volatility
101.6%
 

Risk-free interest rate
1.64%
 

Expected life of options
5 years
 
Schedule of Stock Option Activity
The following table reflects stock option activity in 2016, 2015 and 2014:
 
Approximate
number of
shares
 
Range of exercise
prices per share
 
Weighted
average exercise
price per share
 
Weighted
average remaining
contractual life (years)
Options outstanding at December 31, 2013
378,000

 
$7.95 - $131.10

 
$
33.15

 
1.46
Granted in 2014
1,600

 
$
35.85

 
 
 
3.87
Options exercised in 2014
(153,600
)
 
$13.95 - $34.50

 
 
 
 
Forfeited in 2014
(1,000
)
 
$
24.75

 
 
 
 
Canceled in 2014
(68,800
)
 
$15.00 - $213.75

 
 
 
 
Options outstanding at December 31, 2014
156,200

 
$7.95 - $131.10
 
$
33.25

 
1.47
Options exercised in 2015
(81,600
)
 
$13.95-$27.15

 
 
 
 
Forfeited in 2015
(18,000
)
 
$13.95 -$127.95

 
 
 
 
Options outstanding at December 31, 2015
56,600

 
$7.95 - $131.10

 
$
48.50

 
2.61
Options exercised in 2016
(18,000
)
 
$7.95-$9.90

 
 
 
 
Forfeited in 2016
(5,000
)
 
$14.85 -$82.95

 
 
 
 
Options outstanding at December 31, 2016
33,600

 
$7.95 - $131.10

 
$
68.92

 
1.11