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Note 19 - Income Taxes (Tables)
12 Months Ended
Jul. 31, 2022
Notes Tables  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
  

Year Ended July 31,

 
  

2022

  

2021

  

2020

 

Federal income tax provision rate

  21.00%  21.00%  21.00%

State income tax provision rate, net of federal income tax effect

  2.95%  0.83%  0.72%

Total income tax provision rate

  23.95%  21.83%  21.72%
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
  

Year Ended July 31,

 
  

2022

  

2021

  

2020

 

Income (Loss) before income taxes

 $5,247  $(14,817) $(14,616)

Corporate tax rate

  23.95%  21.83%  21.72%

Expected tax expense (recovery)

  1,257   (3,235)  (3,175)

Increase (decrease) resulting from

            

Foreign tax rate differences

  158   77   86 

Permanent differences

  (326)  (217)  170 

Prior year true-up

  6   (270)  118 

Change in state tax rate

  (460)  (406)  (553)

Foreign exchange rate differences

  (4)  (56)  17 

Other

  188   163   72 

Change in valuation allowance

  (824)  3,940   3,233 

Tax adjustment from operations

  (5)  (4)  (32)
             

Unrealized loss, other comprehensive loss

  -   -   26 

Deferred tax benefits

 $(5) $(4) $(6)
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]
  

Year Ended July 31,

 
  

2022

  

2020

  

2019

 

United States

 $6,054  $(14,297) $(13,962)

Canada

  268   94   54 

Paraguay

  (1,075)  (614)  (708)
  $5,247  $(14,817) $(14,616)
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
  

July 31, 2022

  

July 31, 2021

 

Deferred tax assets (liabilities)

        

Mineral properties

 $1,401  $1,277 

Exploration costs

  1,875   6,547 

Stock option expense

  4,651   4,623 

Depreciable property

  1,078   (1,163)

Inventories

  (3,955)  (3,608)

Asset retirement obligations

  2,924   107 

Other

  654   81 

Section 163(j) interest expense carry forwards

  2,040   1,061 

Loss carry forwards

  70,162   49,988 
   80,830   58,913 

Valuation allowance

  (80,454)  (58,913)

Deferred tax assets

  -   - 

Deferred tax assets, other comprehensive loss

  -   - 
         

Deferred tax liabilities

        

Mineral properties

  (536)  (541)

Net deferred tax liabilities

 $(536) $(541)
Summary of Operating Loss Carryforwards [Table Text Block]

July 31, 2023

 $1,887 

July 31, 2024

  2,035 

July 31, 2025

  2,398 

July 31, 2026

  8,461 

July 31, 2027

  6,807 

Remaining balance

  177,442 
  $199,030 

July 31, 2027

 $183 

July 31, 2028

  630 

July 31, 2029

  769 

July 31, 2030

  764 

July 31, 2031

  1,206 

Remaining balance

  980 
  $4,532