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Note 10 - Income Tax (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
    Years Ended December 31,
    2019   2018   2017
Current                        
Federal   $
2,920
    $
1,772
    $
3,117
 
State    
185
     
439
     
551
 
     
3,105
     
2,211
     
3,668
 
Deferred                        
Federal    
485
     
1,917
     
(1,091
)
State    
306
     
(36
)    
72
 
     
791
     
1,881
     
(1,019
)
Total income tax provision   $
3,896
    $
4,092
    $
2,649
 
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
    December 31,
    2019   2018
Deferred tax assets:                
Reserves   $
362
    $
367
 
Inventory capitalization    
396
     
421
 
Compensation programs    
578
     
447
 
Retirement liability    
-
     
2
 
Equity-based compensation    
403
     
290
 
Lease liability    
795
     
11
 
Intangible assets    
73
     
141
 
State tax credits, net of federal impact    
274
     
257
 
Gross deferred tax assets    
2,881
     
1,936
 
Valuation allowance    
(136
)    
-
 
Net deferred tax assets    
2,745
     
1,936
 
                 
Deferred tax liabilities:                
Excess of book over tax basis of fixed assets    
(4,877
)    
(4,668
)
Goodwill    
(2,008
)    
(1,397
)
Right of use asset    
(781
)    
-
 
Total deferred tax liabilities    
(7,666
)    
(6,065
)
Net long-term deferred tax liabilities   $
(4,921
)   $
(4,129
)
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
    Years Ended December 31,
    2019   2018   2017
Computed “expected” tax rate    
21.0
%    
21.0
%    
34.0
%
Increase (decrease) in income taxes resulting from:                        
State taxes, net of federal tax benefit    
1.8
     
2.8
     
3.5
 
Meals and entertainment    
0.2
     
0.2
     
0.3
 
Tax credits    
(6.2
)    
(1.9
)    
(0.6
)
Domestic production deduction    
-
     
-
     
(2.6
)
Non-deductible ISO stock option expense    
-
     
0.1
     
0.1
 
Unrecognized tax benefits    
(0.7
)    
-
     
-
 
Excess tax benefits on equity awards    
(0.7
)    
(1.3
)    
(1.4
)
Excess compensation    
0.6
     
0.8
     
-
 
Impact on deferred taxes of new legislation    
-
     
-
     
(11.1
)
Other    
0.4
     
0.5
     
0.1
 
Change in valuation allowance    
0.1
     
-
     
-
 
Effective tax rate    
16.5
%    
22.2
%    
22.3
%
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]
    December 31,
    2019   2018
Gross UTB balance at beginning of fiscal year   $
150
    $
150
 
Reductions for tax positions of prior years    
(150
)    
-
 
Gross UTB balance at end of fiscal year   $
-
    $
150