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Note 14 - Unaudited Quarterly Data (in thousands, except per share data) (Tables)
 12 Months Ended
Dec. 31, 2012
Schedule of Quarterly Financial Information [Table Text Block]
 
Fiscal Year 2012
 
Fiscal Year 2011
 
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
 
First
Quarter
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
 
Statements of Income Data:
                                               
Revenues
$
198,533
 
$
197,481
 
$
204,388
 
$
211,079
 
$
167,999
 
$
168,392
 
$
179,356
 
$
185,885
 
Gross profit
$
45,642
 
$
45,713
 
$
41,203
 
$
47,318
 
$
38,274
 
$
37,708
 
$
39,959
 
$
42,596
 
Administrative, salary and payroll taxes
$
27,914
 
$
28,702
 
$
25,414
 
$
32,074
 
$
21,893
 
$
22,999
 
$
26,313
 
$
27,619
 
Net income
$
14,570
 
$
14,071
 
$
12,626
 
$
11,835
 
$
13,629
 
$
13,224
 
$
11,772
 
$
12,310
 
Basic earnings per share
$
0.96
 
$
0.93
 
$
0.86
 
$
0.81
 
$
0.91
 
$
0.88
 
$
0.79
 
$
0.82
 
Diluted earnings per share
$
0.95
 
$
0.92
 
$
0.85
 
$
0.81
 
$
0.90
 
$
0.87
 
$
0.77
 
$
0.81
 
                                                 
As a Percentage of Revenues:
                                               
Gross profit
 
23.0
%
 
23.1
%
 
20.2
%
 
22.4
%
 
22.8
%
 
22.4
%
 
22.3
%
 
22.9
%
Administrative, salary and payroll taxes
 
14.1
%
 
14.5
%
 
12.4
%
 
15.2
%
 
13.0
%
 
13.7
%
 
14.7
%
 
14.9
%
Net income
 
7.3
%
 
7.1
%
 
6.2
%
 
5.6
%
 
8.1
%
 
7.9
%
 
6.6
%
 
6.6
%