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Note 5 - Income Taxes (Tables)
12 Months Ended
Mar. 31, 2022
Notes Tables  
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
  

March 31,

 
  

2022

  

2021

 

Deferred tax assets:

        

Accrued expenses

 $364  $406 

Deferred stock compensation

  662   321 

Bad debt and inventory reserves

  27   29 
         

Total deferred tax assets

  1,053   756 
         

Deferred tax liabilities:

        

Property and equipment

  (1,989)  (2,037)
         

Total net deferred tax liabilities

 $(936) $(1,281)
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
  

Year Ended March 31,

 
  

2022

  

2021

  

2020

 
             

Current taxes

            

Federal

 $5,801  $7,446  $7,352 

State

  515   856   841 

Total current taxes

  6,316   8,302   8,193 
             

Deferred taxes

            

Federal

  (317)  279   (135)

State

  (28)  32   (16)

Total deferred taxes

  (345)  311   (151)
             

Total provision for income taxes

 $5,971  $8,613  $8,042 
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
  

Year Ended March 31,

 
  

2022

  

2021

  

2020

 
             

Income taxes at U.S. statutory rates

 $5,685  $8,235  $7,118 

State income taxes, net of federal tax benefit

  379   708   649 

Restricted stock (windfall) shortfall adjustment

  33   (135)  322 

Other

  (126)  (195)  (47)
             

Total provision for income taxes

 $5,971  $8,613  $8,042