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Inventories, net (Tables)
 12 Months Ended
Dec. 31, 2025
Notes and other explanatory information [abstract]  
Schedule of inventories

 

   As of December 31, 2025 
   Cost  

Allowance for

valuation loss

   Book value 
Merchandise inventory:               
Raw materials  $522,432   $(6,747)  $515,685 
Work in progress   19,491    (14)   19,477 
Finished goods   521,722    (26,516)   495,206 
   $1,063,645   $(33,277)  $1,030,368 
Schedule of cost of inventories

The cost of inventories recognized for the year:

 

   Year ended   Year ended   Year ended 
   December 31,2025   December 31, 2024   December 31, 2023 
Cost of goods sold  $4,540,840   $11,921,857   $20,893,411 
provision (reversal) for allowance for valuation loss   19,513    11,324    (37,569)
Cost of inventories  $4,560,353   $11,933,181   $20,855,842