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Stock-based compensation (Tables)
12 Months Ended
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The significant weighted average assumptions for the years ended December 31, 2015, 2014 and 2013 were as follows:
 
 
 
2015
 
2014
 
2013
 
Risk free interest rate
 
 
0.41
%
 
0.48
%
 
0.47
%
Expected option life (years)
 
 
1.4
 
 
1.4
 
 
1.7
 
Expected volatility
 
 
33.74
%
 
48.06
%
 
27.87
%
Expected dividend yield
 
 
2.35
%
 
2.71
%
 
2.71
%
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
A summary of the Company’s stock option activity for the year ended December 31, 2015 is as follows:
 
 
 
Options
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Remaining
Contractual Life
(Years)
 
Aggregate
Intrinsic
Value (1)
 
Outstanding at beginning of period
 
 
186,632
 
$
10.18
 
 
 
 
 
 
Granted
 
 
12,645
 
 
9.92
 
 
 
 
 
 
Exercised
 
 
(48,885)
 
 
7.90
 
 
 
 
 
 
Forfeited/expired
 
 
(55,914)
 
 
10.30
 
 
 
 
 
 
Outstanding as of December 31, 2015
 
 
94,478
 
$
10.52
 
1.06 years
 
$
164,500
 
Exercisable as of December 31, 2015
 
 
75,078
 
$
10.46
 
0.86 years
 
$
133,764
 
 
(1)
The intrinsic value of a stock option represents the amount by which the fair value of the underlying stock, measured by reference to the closing price of the common shares of $12.24 on the Nasdaq Global Select Market on December 31, 2015, exceeds the exercise price of the option.
 
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]
The following table summarizes the weighted average fair value of options at the date of grant and the intrinsic value of options exercised during the years ended December 31, 2015, 2014 and 2013:
 
 
 
2015
 
2014
 
2013
 
Options granted with an exercise price below market price on the date of grant:
 
 
 
 
 
 
 
 
 
 
Employees — preferred stock
 
$
4.19
 
$
-
 
$
4.65
 
Overall weighted average
 
$
4.19
 
$
-
 
$
4.65
 
 
 
 
 
 
 
 
 
 
 
 
Options granted with an exercise price at market price on the date of grant:
 
 
 
 
 
 
 
 
 
 
Management employees
 
$
-
 
$
-
 
$
-
 
Employees — common stock
 
$
3.39
 
$
3.11
 
$
3.18
 
Overall weighted average
 
$
3.39
 
$
3.11
 
$
3.18
 
 
 
 
 
 
 
 
 
 
 
 
Options granted with an exercise price above market price on the date of grant:
 
 
 
 
 
 
 
 
 
 
Management employees
 
$
-
 
$
-
 
$
-
 
Employees — preferred stock
 
$
-
 
$
0.59
 
$
-
 
Overall weighted average
 
$
-
 
$
0.59
 
$
-
 
 
 
 
 
 
 
 
 
 
 
 
Total intrinsic value of options exercised
 
$
87,371
 
$
17,162
 
$
190,212