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Stock Option Plans | 12 Months Ended
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Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock Option Plans | 11. Stock Option Plans The Company grants stock options under the 2012 Employee Stock Option Plan. The Company also has three plans under which the Company no longer grants options but under which certain options remain outstanding: the 1996 Non-Salaried Director Stock Option Plan, the 2002 Employee stock Option Plan and the 2005 Non-Salaried Director Stock Option Plan. The Employee Plan, which became effective April 23, 2012, provides for the issuance of incentive and nonqualified stock options at an exercise price equal to the fair market value of the Common Stock on the date the option is granted. The terms of the options granted are subject to the provisions of the Employee Plan. Options granted under the Employee Plan vest 25% one day after the first anniversary of the grant date and 25% one day after each of the next three anniversaries. As of December 31, 2015, the number of shares available for grant under the Employee Plan was 199,850. Under the terms of the Employee Plan, no option may be granted under that plan after the tenth anniversary of the adoption of the plan. Options outstanding under the Company’s 2002 Employee Stock Option Plan have the same vesting schedule as the 2012 Employee plan. The Director Plan, as amended, provided for the issuance of stock options for up to 180,000 shares of the Company's common stock to non-salaried directors. Under the Director Plan, Directors elected on April 25, 2005 and at subsequent Annual Meetings who have not received any prior grant under this or previous plans received an initial grant of an option to purchase 5,000 shares of Common Stock (the “Initial Option”). Each year, each elected Director not receiving an Initial Option received a 5,000 share option (the “Annual Option”). The Initial Option vests 25% on the date of grant and 25% on the anniversary of the grant date in each of the following 3 years. Each Annual Option becomes fully exercisable one day after the date of grant. The exercise price of each option granted equals the fair market value of the Common Stock on the date the option is granted, and expires ten (10) years from the date of grant. As provided in the Director Plan, no options may be granted under the Director Plan after the tenth anniversary of the adoption of the Plan, i.e., after April 25, 2015. On that date, the number of shares underlying options which remained available for grant under the Director Plan was 1,500. A summary of changes in options issued under the Company’s stock option plans follows:
|  | 2015 |  | 2014
Options outstanding at the |  |  |  |  |  |  |  |
beginning of the year |  |  | 1,357,813 |  |  |  | 1,236,063 |
Options granted |  |  | 47,000 |  |  |  | 214,500 |
Options forfeited |  |  | (39,375 | ) |  |  | (2,500 | )
Options exercised |  |  | (97,636 | ) |  |  | (90,250 | )
Options outstanding at |  |  |  |  |  |  |  |
the end of the year |  |  | 1,267,802 |  |  |  | 1,357,813 |
Options exercisable at the |  |  |  |  |  |  |  |
end of the year |  |  | 970,017 |  |  |  | 880,743 |
Common stock available for future grants at the end of the year |  |  | 201,350 |  |  |  | 36,475 |
Weighted average exercise price per share: |  |  |  |  |  |  |  |
Granted |  | $ | 18.90 |  |  | $ | 16.68 |
Forfeited |  |  | 15.65 |  |  |  | 14.22 |
Exercised |  |  | 12.79 |  |  |  | 12.62 |
Outstanding |  |  | 12.46 |  |  |  | 12.35 |
Exercisable |  |  | 11.72 |  |  |  | 11.53 |
A summary of options outstanding at December 31, 2015 is as follows:
|  | Options Outstanding |  | Options Exercisable
Range of Exercise Prices | Number Outstanding | Weighted- Average Remaining Contractual Life (Years) | Weighted- Average Exercise Price |  | Number Exercisable | Weighted- Average Exercise Price
$6.81 to $10.25 | 463,595 | 5 | $ 9.45 |  | 448,435 | $ 9.43
$10.26 to $13.62 | 291,250 | 5 | 11.69 |  | 242,250 | 11.80
$13.63 to $15.33 | 271,457 | 5 | 14.32 |  | 195,707 | 14.51
$15.34 to $19.50 | 241,500 | 6 | 17.09 |  | 83,625 | 17.28
| 1,267,802 |  |  |  | 970,017 |
The weighted average remaining contractual life of all outstanding stock options is 6 years. Stock Based Compensation Stock-based compensation cost is measured at the grant date based on the fair value of the award and is recognized as expense over the requisite service period, which is generally the vesting period. The Company uses the Black-Scholes option pricing model to determine the fair value of employee and non-employee director stock options. The determination of the fair value of stock-based payment awards on the date of grant, using an option-pricing model, is affected by the Company’s stock price as well as assumptions regarding a number of complex and subjective variables. These assumptions include estimating the length of time employees will retain their vested stock options before exercising them (“expected term”), the estimated volatility of the Company’s Common Stock price over the expected term (“volatility”) and the number of options that will not fully vest in accordance with applicable vesting requirements (“forfeitures”). The Company estimates the expected term of options granted by evaluating various factors, including the vesting period, historical employee information, as well as current and historical stock prices and market conditions. The Company estimates the volatility of its common stock by calculating historical volatility based on the closing stock price on the last day of each of the 60 months leading up to the month the option was granted. The risk-free interest rate that the Company uses in the option valuation model is the interest rate on U.S. Treasury zero-coupon bond issues with remaining terms similar to the expected term of the options granted. Historical information was the basis for calculating the dividend yield. The Company is required to estimate forfeitures at the time of grant and to revise those estimates in subsequent periods if actual forfeitures differ from those estimates. The Company used a mix of historical data and future assumptions to estimate pre-vesting option forfeitures and to record stock-based compensation expense only for those awards that are expected to vest. All stock-based payment awards are amortized over the requisite service periods of the awards, which are generally the vesting periods. The assumptions used to value option grants for the twelve months ended December 31, 2015 and December 31, 2014 were as follows:
|  | 2015 | 2014
Expected life in years |  | 5 | 5
Interest rate |  | 1.33 – 1.62% | 1.53 – 1.77%
Volatility |  | .234-.252 | .245-.282
Dividend yield |  | 1.95% - 2.10% | 2.0%
Total stock-based compensation recognized in the Company’s consolidated statements of operations for the years ended December 31, 2015 and 2014 was $513,986 and $561,856, respectively. At December 31, 2015, there was approximately $701,057 of unrecognized compensation cost, adjusted for estimated forfeitures, related to non-vested stock-based payments granted to the Company’s employees. As of December 31, 2015, the remaining unamortized expense is expected to be recognized over a weighted average period of 3 years. The weighted average fair value at the date of grant for options granted during 2015 and 2014 was $3.44 and $3.27 per option, respectively. The aggregate intrinsic value of outstanding options was $6,239,715 at December 31, 2015. The aggregate intrinsic value of exercisable options was $5,543,783 at December 31, 2015. The aggregate intrinsic value of options exercised during 2015 was $8,630,045.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=51659978&loc=d3e25284-112666 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 + Details
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