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Note 10 - Income Taxes (Tables)
12 Months Ended
Mar. 31, 2016
Notes Tables  
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]
 
 
Year Ended March 31,
 
 
 
2016
 
 
2015
 
 
2014
 
Domestic
  $ 14,427     $ 14,896     $ 13,103  
Foreign
    1,128       451       --  
    $ 15,555     $ 15,347     $ 13,103  
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
 
 
Year Ended March 31,
 
 
 
2016
 
 
2015
 
 
2014
 
Current tax provision
                       
Federal
  $ 3,666     $ 4,186     $ 4,031  
State
    627       1,135       106  
Foreign
    658       212       --  
      4,951       5,533       4,137  
Deferred tax provision:
                       
Federal
    (189 )     252       (19 )
State
    (138 )     51       (15 )
Foreign
    (238 )     (72 )     --  
      (565 )     231       (34 )
    $ 4,386     $ 5,764     $ 4,103  
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
 
 
March 31,
 
 
 
201
6
 
 
201
5
 
Current deferred tax assets:
               
Accrued employee-related expenses
  $ 257     $ 252  
Allowances and reserves
    217       346  
Stock option deductible differences
    606       388  
Inventory
    533       252  
Foreign tax credit mirror
    --       285  
Currency translation adjustment
    12       144  
Net operating loss
    110       22  
Other
    3       --  
      1,738       1,689  
                 
Long-term deferred tax liability:
               
Property, plant and equipment
    (1,599 )     (1,478 )
Goodwill and intangible assets
    (4,335 )     (3,644 )
Other
    (5 )     --  
      (5,939 )     (5,122 )
                 
Net deferred tax liability
  $ (4,201 )   $ (3,433 )
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
 
 
Year Ended March 31,
 
 
 
2016
 
 
2015
 
 
2014
 
Federal income taxes at statutory rates
  $ 5,445     $ 5,374     $ 4,586  
State income taxes, net of federal benefit
    293       860       78  
Tax benefit of stock option exercises
    (751 )     209       5  
Section 199 manufacturing deduction
    (440 )     (317 )     (250 )
Research and development credit
    (345 )     (248 )     (159 )
Other
    184       (114 )     (157 )
    $ 4,386     $ 5,764     $ 4,103  
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]
 
 
Year Ended March 31,
 
 
 
2016
 
 
2015
 
 
2014
 
Beginning balance
  $ --     $ --     $ --  
Increases related to current period tax positions
    221       --       --  
Ending balance
  $ 221     $ --     $ --