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Note 15 - Income Taxes (Tables)
12 Months Ended
Dec. 31, 2025
Notes Tables  
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
  

During the Years

 
  

Ended December 31,

 
  

2025

  

2024

 

Current

        

Federal

 $  $ 

State

  11,570   10,056 

Current subtotal

  11,570   10,056 

Deferred

        

Federal

  (220,758)  (500,927)

State

  (111,888)  (59,032)

Deferred subtotal, gross

  (332,646)  (559,959)

Valuation allowance

  332,646   559,959 

Deferred subtotal, net

      

Income tax expense

 $11,570  $10,056 
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]
  

During the Years

 
  

Ended December 31,

 
  

2025

  

2024

 

Domestic

 $(1,028,457) $(2,146,573)

Foreign

      

Loss before income taxes

 $(1,028,457) $(2,146,573)
Schedule of Cash Paid for Income Taxes [Table Text Block]
  

During the Years

 
  

Ended December 31,

 
  

2025

  

2024

 

Federal

 $  $ 
         

State and Local — California

  800   800 

State and Local — Michigan

  791    

State and Local — Minnesota

     1,000 

State and Local — New York

  4,000   2,403 

State and Local — Pennsylvania

  1,300    

State and Local — Texas

  3,687   3,010 

State and Local — Other

  113   80 

State and Local

  10,691   7,293 
         

International — Other

      

International

      
         

Total income taxes paid

 $10,691  $7,293 
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
  

During the Years Ended December 31,

 
  

2025

  

2024

 
   Amount   Percent   Amount   Percent 

Computed tax at Federal Statutory Rate (21%)

 $(215,976)  (21.00)% $(450,780)  (21.00)%

State and local income taxes, net of federal benefit(1)

  (79,693)  (7.75)%  (36,681)  (1.71)%

Foreign tax effects

     0.00%     0.00%

Effect of changes in tax laws/rates

     0.00%     0.00%

Effect of cross-border tax laws

     0.00%     0.00%

Research and experimental tax credits

  (58,901)  (5.73)%  (116,091)  (5.41)%

Changes in valuation allowance

  332,646   32.34%  559,959   26.09%

Nontaxable/nondeductible items

  5,280   0.51%  4,619   0.22%

Share-based compensation

  28,214   2.75%  49,030   2.28%

Changes in unrecognized tax benefits

     0.00%     0.00%

Income tax expense

 $11,570   1.12% $10,056   0.47%
Schedule of State and Local Income Taxes [Table Text Block]
  

During the Years Ended December 31,

 
  

2025

  

2024

 
  

Amount

  

Percent

  

Amount

  

Percent

 

California

 $(16,720)  20.98% $(17,422)  47.50%

Maine

     0.00%  (6,456)  17.60%

Michigan

  (7,070)  8.87%     0.00%

Minnesota

  (15,018)  18.85%  (7,158)  19.51%

New York

  (16,164)  20.28%  (5,364)  14.62%

Pennsylvania

  (26,380)  33.10%  (6,187)  16.87%

Other

  1,659   (2.08)%  5,906   (16.10)%

State and local income taxes, net of federal benefit

 $(79,693)  100.00% $(36,681)  100.00%
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
  

As of

 
  

December 31,

 
  

2025

  

2024

 

Property, plant and equipment

 $(950,593) $(1,833,727)

Federal general business tax credits

  901,466   842,565 

Federal net operating loss carryforwards

  3,674,316   3,705,923 

State tax credits and net operating loss carryforwards

  927,108   900,569 

§174 R & D expenditures

  39,034   727,410 

Deferred compensation

  52,872   82,370 

Prepaid expenses and other

  74,110   24,718 

UNICAP

  54,047   22,443 

Incentive compensation

  154,275   121,718 

Valuation allowance

  (4,926,635)  (4,593,989)

Deferred tax assets, net

 $  $