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Note 13 - Employee Benefit Plans
12 Months Ended
Dec. 31, 2016
Notes to Financial Statements  
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]
NOTE
13:
          EMPLOYEE BENEFIT PLANS
 
Retirement Plans
 
The Company has a
401(k)
retirement plan that covers substantially all employees.  The Company has also historically had a discretionary profit sharing and employee stock ownership plan (“ESOP”) covering substantially all employees.  Effective
December
31,
2016,
the ESOP was merged into the Company’s
401(k)
retirement plan. This merger will allow participants to fully diversify their ESOP account balance and have reporting access to all retirement account balances in
one
place. Contribution expense to the plans totaled
$5,488,000,
$6,278,000
and
$4,496,000
in
2016,
2015
and
2014,
respectively.
 
The Company also provides deferred compensation agreements with certain active and retired officers.  The agreements provide monthly payments of retirement compensation for either stated periods or for the life of the participant.  The charges to income for the plans were
$1,056,000
for
2016,
$804,000
for
2015
and
$453,000
for
2014.
  Such charges reflect the straight-line accrual over the employment period of the present value of benefits due each participant, as of their full eligibility date, using an appropriate discount factor.
 
Employee Stock Purchase Plan
 
The Company established an Employee Stock Purchase Plan in
2015
which generally allows participants to make contributions of up to
$25,000
per year, for the purpose of acquiring the Company’s stock.  At the end of each plan year, full shares of the Company’s stock are purchased for each employee based on that employee’s contributions. The Company has issued both general and special stock offerings under the plan. Substantially all employees are eligible for the general stock offering, under which full shares of the Company’s stock are purchased for an amount equal to
95%
of their fair market value at the end of the plan year, or, if lower,
95%
of their fair market value at the beginning of the plan year.
 
The special stock offering is available to substantially all non-highly compensated employees with at least
six
months of service, and these employees
may
allocate up to
$10,000
to this offering. Under the special stock offering, full shares of the Company’s stock are purchased for an amount equal to
85%
of their fair market value at the end of the plan year, or, if lower,
85%
of their fair market value at the beginning of the plan year.
 
Stock-Based Compensation Plans
 
The Company’s Board of Directors has adopted various stock-based compensation plans.  The plans provide for the grant of incentive stock options, nonqualified stock options, stock appreciation rights, restricted stock awards, restricted stock units, and performance stock units.  Pursuant to the plans, shares are reserved for future issuance by the Company upon exercise of stock options or awarding of bonus shares granted to directors, officers and other key employees.
 
 
109
 
 
 
Stock-based compensation expense for all stock-based compensation awards granted after
January
1,
2006,
is based on the grant date fair value.  For all awards except stock option awards, the grant date fair value is the market value per share as of the grant date.  For stock option awards, the fair value is estimated at the date of grant using the Black-Scholes option-pricing model.  This model requires the input of highly subjective assumptions, changes to which can materially affect the fair value estimate.  Additionally, there
may
be other factors that would otherwise have a significant effect on the value of employee stock options granted but are not considered by the model.  Accordingly, while management believes that the Black-Scholes option-pricing model provides a reasonable estimate of fair value, the model does not necessarily provide the best single measure of fair value for the Company's employee stock options.
 
The fair value of each option award is estimated on the date of grant using the Black-Scholes option-pricing model that uses various assumptions.  Expected volatility is based on historical volatility of the Company’s stock and other factors.  The Company uses historical data to estimate option exercise and employee termination within the valuation model.  The expected term of options granted is derived from the output of the option valuation model and represents the period of time that options granted are expected to be outstanding.  The risk-free rate for periods within the contractual life of the option is based on the U.S. Treasury yield curve in effect at the time of grant.  Forfeitures are estimated at the time of grant, and are based partially on historical experience.
 
The table below summarizes the transactions under the Company's active stock compensation plans at
December
31,
2016,
2015
and
2014,
and changes during the years then ended:
 
    Stock Options
Outstanding
  Stock Awards
Outstanding
  Stock Units
Outstanding
    Number
of Shares
(000)
  Weighted
Average
Exercise
Price
  Number
of Shares
(000)
  Weighted
Average
Exercise
Price
  Number
of Shares
(000)
  Weighted
Average
Exercise
Price
                         
Balance, December 31, 2013    
185
    $
27.04
     
145
    $
26.00
     
--
    $
--
 
Granted    
--
     
--
     
134
     
37.51
     
--
     
--
 
Stock Options Exercised    
(65
)    
25.86
     
--
     
--
     
--
     
--
 
Stock Awards/Units Vested    
--
     
--
     
(51
)    
30.62
     
--
     
--
 
Forfeited/Expired    
--
     
--
     
(1
)    
26.54
     
--
     
--
 
                                                 
Balance, December 31, 2014    
120
     
27.72
     
227
     
31.88
     
--
     
--
 
Granted    
375
     
44.69
     
95
     
43.45
     
20
     
37.15
 
Stock Options Exercised    
(71
)    
22.57
     
--
     
--
     
--
     
--
 
Stock Options from Acquisitions    
66
     
20.43
     
--
     
--
     
--
     
--
 
Stock Awards/Units Vested    
--
     
--
     
(131
)    
34.77
     
--
     
--
 
Forfeited/Expired    
(5
)    
24.49
     
(20
)    
35.36
     
--
     
--
 
                                                 
Balance, December 31, 2015    
485
     
40.62
     
171
     
35.65
     
20
     
37.15
 
Granted    
58
     
47.02
     
136
     
46.92
     
108
     
46.95
 
Stock Options Exercised    
(64
)    
30.28
     
--
     
--
     
--
     
--
 
Stock Awards/Units Vested    
--
     
--
     
(159
)    
41.91
     
(12
)    
45.54
 
Forfeited/Expired    
(6
)    
35.05
     
(9
)    
43.70
     
(3
)    
47.02
 
                                                 
Balance, December 31, 2016    
473
    $
42.85
     
139
    $
40.96
     
113
    $
45.40
 
                                                 
Exercisable, December 31, 2016    
322
    $
41.82
     
 
     
 
     
 
     
 
 
 
 
110
 
 
 
The following table summarizes information about stock options under the plans outstanding at
December
31,
2016:
 
        Options Outstanding   Options Exercisable
Range of
Exercise Prices
  Number
of Shares
(000)
  Weighted
Average
Remaining
Contractual
Life (Years)
  Weighted
Average
Exercise
Price
  Number
of Shares
(000)
  Weighted
Average
Exercise
Price
                         
$17.55
-
$21.29
   
13
     
4.58
    $
19.93
     
8
    $
19.58
 
21.51
-
21.51
   
2
     
3.05
     
21.51
     
2
     
21.51
 
28.42
-
28.42
   
18
     
0.38
     
28.42
     
18
     
28.42
 
30.31
-
30.31
   
26
     
1.35
     
30.31
     
26
     
30.31
 
40.57
-
40.57
   
41
     
8.00
     
40.57
     
40
     
40.57
 
40.72
-
40.72
   
2
     
7.88
     
40.72
     
1
     
40.72
 
44.40
-
44.40
   
52
     
8.23
     
44.40
     
24
     
44.40
 
45.50
-
45.50
   
258
     
8.61
     
45.50
     
200
     
45.50
 
47.02
-
47.02
   
58
     
9.05
     
47.02
     
--
     
--
 
48.13
-
48.13
   
3
     
8.71
     
48.13
     
3
     
48.13
 
$17.55
-
$48.13
   
473
     
7.72
    $
42.84
     
322
    $
41.82
 
 
Stock-based compensation expense was
$5,451,000
in
2016,
$4,018,000
in
2015
and
$1,366,000
in
2014.
  Stock-based compensation expense is recognized ratably over the requisite service period for all stock-based awards.  There was
$842,000
of unrecognized stock-based compensation expense related to stock options at
December
31,
2016.
Unrecognized stock-based compensation expense related to non-vested stock awards was
$7.8
million at
December
31,
2016.
  At such date, the weighted-average period over which this unrecognized expense is expected to be recognized was
2.6
years.
 
The intrinsic value of stock options outstanding and stock options exercisable at
December
 
31,
2016
was
$9,128,000
and
$6,552,000.
  Aggregate intrinsic value represents the difference between the Company’s closing stock price on the last trading day of the period, which was
$62.15
at
December
31,
2016,
and the exercise price multiplied by the number of options outstanding. There were
63,712
stock options exercised in
2016,
with an intrinsic value of
$2,031,000.
  There were
71,368
stock options exercised in
2015,
with an intrinsic value of
$2,054,000.
There were
64,720
stock options exercised in
2014,
with an intrinsic value of
$957,000.
 
 
The fair value of the Company’s employee stock options granted is estimated on the date of grant using the Black-Scholes option-pricing model. This model requires the input of highly subjective assumptions, changes to which can materially affect the fair value estimate. The weighted-average fair value of stock options granted during the year ended
December
31,
2016
was
$11.64
per share. The weighted-average fair value of stock options granted during the year ended
December
31,
2015
was
$7.81
per share. There were no stock options granted during the year ended
December
31,
2014.
The Company estimated expected market price volatility and expected term of the options based on historical data and other factors. The weighted-average assumptions used to determine the fair value of options granted are detailed in the table below:
 
    Year Ended
December 31, 2016
  Year Ended
December 31, 2015
         
Expected dividend yield    
1.96
%    
2.06
%
Expected stock price volatility    
27.34
%    
16.96
%
Risk-free interest rate    
2.01
%    
2.17
%
Expected life of options    
7 years
     
10 years