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Note 4 - Inventories (Tables)
6 Months Ended
Jun. 30, 2022
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
  

June 30,

2022

  

December 31,

2021

 

Parts inventory

 $118,873  $102,763 

Fuel inventory

  182,780   115,364 

Other inventory

  21,928   24,977 

Total inventory

 $323,581  $243,104