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Note 5 - Income Taxes (Tables)
12 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
  

March 31,

 
  

2021

  

2020

 

Deferred tax assets:

        

Accrued expenses

 $406  $287 

Deferred stock compensation

  321   469 

Bad debt and inventory reserves

  29   24 
         

Total deferred tax assets

  756   780 
         

Deferred tax liabilities:

        

Property and equipment

  (2,037)  (1,750)
         

Total net deferred tax liabilities

 $(1,281) $(970)
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
  

Year Ended March 31,

 
  

2021

  

2020

  

2019

 
             

Current taxes

            

Federal

 $7,446  $7,352  $9,718 

State

  856   841   1,538 

Total current taxes

  8,302   8,193   11,256 
             

Deferred taxes

            

Federal

  279   (135)  108 

State

  32   (16)  17 

Total deferred taxes

  311   (151)  125 
             

Total provision for income taxes

 $8,613  $8,042  $11,381 
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
  

Year Ended March 31,

 
  

2021

  

2020

  

2019

 
             

Income taxes at U.S. statutory rates

 $8,235  $7,118  $10,315 

State income taxes, net of federal tax benefit

  708   649   1,233 

Restricted stock (windfall) shortfall adjustment

  (135)  322   (176)

Other

  (195)  (47)  9 
             

Total provision for income taxes

 $8,613  $8,042  $11,381