Annual report [Section 13 and 15(d), not S-K Item 405]

Summary of Significant Accounting Policies (Narrative) (Details)

v3.26.1
Summary of Significant Accounting Policies (Narrative) (Details)
 12 Months Ended
Dec. 31, 2025
USD ($)
segment
item
$ / shares
shares
Dec. 31, 2024
USD ($)
item
shares
Summary of Significant Accounting Policies [Line Items]    
Value of the investment in short-term money market funds sought to be preserved (in dollars per share) | $ / shares $ 1.00  
Inventory reserves $ 362,277 $ 226,439
Depreciation $ 265,615 316,332
Maximum matching percentage by employer 6.00%  
Advertising expense $ 847,779 746,805
Number of operating segments | segment 2  
Number of reportable segments | segment 2  
Goodwill, Impairment Loss   $ 3,101,981
Dilutive effect $ 0  
Shares not included in the computation of diluted earnings per share | shares 3 9
Deemed dividend on Convertible Preferred Stock and PIPE Warrants   $ 11,587,121
Number of top suppliers | item 5 5
Write off of uncollectible amounts $ 1,775 $ 6,356
Impairment loss $ 750,000  
Number of customers for more than ten percent of net revenues | item 0 0
Minimum [Member]    
Summary of Significant Accounting Policies [Line Items]    
Commercial contract completion period 3 months  
Large project construction completion period 18 months  
Maximum [Member]    
Summary of Significant Accounting Policies [Line Items]    
Commercial contract completion period 12 months  
Large project construction completion period 24 months  
Solar Panels [Member]    
Summary of Significant Accounting Policies [Line Items]    
Warranty period 25 years  
Inverters [Member]    
Summary of Significant Accounting Policies [Line Items]    
Warranty period 10 years  
Workmanship [Member]    
Summary of Significant Accounting Policies [Line Items]    
Warranty period 25 years  
Employee Savings Plan [Member]    
Summary of Significant Accounting Policies [Line Items]    
Employer contributions $ 331,715 $ 303,878
Share-Based Payment Arrangement, Option [Member]    
Summary of Significant Accounting Policies [Line Items]    
Shares not included in the computation of diluted earnings per share | shares 0 0
Number of options outstanding | shares 0 0
Deferred Stock Award [Member]    
Summary of Significant Accounting Policies [Line Items]    
Number of options outstanding | shares 0 0
Supplier Concentration Risk [Member] | Accounts Payable [Member] | Top 5 Suppliers [Member]    
Summary of Significant Accounting Policies [Line Items]    
Concentration risk percentage 47.00% 40.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customers [Member]    
Summary of Significant Accounting Policies [Line Items]    
Concentration risk percentage 10.00% 10.00%
State Of Hawaii Tax Jurisdiction [Member]    
Summary of Significant Accounting Policies [Line Items]    
Gross excise tax revenue $ 1,002,557 $ 744,570
Gross excise tax expense $ 1,004,490 763,370
HEC [Member]    
Summary of Significant Accounting Policies [Line Items]    
Goodwill, Impairment Loss   $ 3,101,981