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Note 14 - Income Taxes (Tables)
12 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]
   
Year Ended March 31,
 
   
2020
   
2019
   
2018
 
Domestic
  $
15,630
    $
12,133
    $
12,708
 
Foreign
   
(12,197
)    
(3,510
)    
(12,407
)
Total earnings before income taxes
  $
3,433
    $
8,623
    $
301
 
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
   
Year Ended March 31,
 
   
2020
   
2019
   
2018
 
Current tax provision
                       
U.S. Federal
  $
2,348
    $
1,831
    $
3,732
 
U.S. State
   
814
     
449
     
715
 
Foreign
   
993
     
1,166
     
1,299
 
Total current tax expense
   
4,155
     
3,446
     
5,746
 
Deferred tax provision:
                       
U.S. Federal
   
60
     
(741
)    
(1,589
)
U.S. State
   
599
     
(106
)    
(216
)
Foreign
   
(2,730
)    
(1,460
)    
(678
)
Total deferred tax expense
   
(2,071
)    
(2,307
)    
(2,483
)
Total income tax expense
  $
2,084
    $
1,139
    $
3,263
 
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
   
March 31, 2020
   
March 31, 2019
 
Deferred tax assets:
               
Accrued employee-related expenses
  $
208
    $
163
 
Allowances and reserves
   
105
     
100
 
Stock compensation deductible differences
   
1,265
     
1,061
 
Inventories
   
504
     
1,534
 
Net operating loss
   
8,874
     
47
 
Foreign tax credit
   
--
     
16
 
Credits    
47
     
--
 
Other
   
458
     
807
 
Total deferred tax assets
   
11,461
     
3,728
 
Deferred tax liabilities:
               
Property, plant and equipment
   
(1,286
)    
(1,118
)
Goodwill and intangible assets
   
(24,825
)    
(2,249
)
Debt    
(5,982
)    
--
 
Currency translation adjustment    
(64
)    
(33
)
Other
   
(1
)    
(6
)
Total deferred tax liabilities
   
(32,158
)    
(3,406
)
Valuation allowance
   
(391
)
   
(76
)
Net deferred tax asset (liability)
  $
(21,088
)   $
246
 
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
   
Year Ended March 31,
 
   
2020
   
2019
   
2018
 
Federal income taxes at statutory rates
  $
721
    $
1,811
    $
93
 
State income taxes, net of federal benefit
   
1,147
     
208
     
328
 
Tax benefit of stock option exercises
   
(1,576
)    
(2,034
)    
(1,087
)
Section 199 manufacturing deduction
   
--
     
--
     
(381
)
Research and development credit
   
(191
)    
(158
)    
(162
)
Tax Cuts and Jobs Act
   
--
     
--
     
(59
)
Impairment of non-deductible goodwill
   
--
     
284
     
4,257
 
Limitation for 162(m)
   
1,112
     
766
     
--
 
Foreign rate differential    
657
     
 
     
 
 
Other
   
214
     
262
     
274
 
Total income tax expense
  $
2,084
    $
1,139
    $
3,263
 
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]
   
Year Ended March 31,
 
   
2020
   
2019
   
2018
 
Beginning balance
  $
1,361
    $
827
    $
331
 
Decreases related to prior period tax positions    
(1,027
)    
--
     
--
 
Increases related to current period tax positions
   
319
     
534
     
496
 
Ending balance
  $
653
    $
1,361
    $
827