v3.26.3
Note 7 - Real Estate Development - Summary of Equity Method Investments (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Jun. 30, 2026
Dec. 31, 2025
Jun. 30, 2025
Dec. 31, 2024
Current assets $ 30,465,897   $ 30,465,897     $ 25,043,269    
Noncurrent assets 87,356,725   87,356,725     87,537,811    
Current liabilities 12,276,624   12,276,624     9,629,249    
Noncurrent liabilities 20,521,397   20,521,397     19,073,783    
Joint ventures' equity 85,024,601 $ 84,124,866 85,024,601 $ 84,124,866 $ 84,020,614 83,878,048 $ 83,600,611 $ 84,088,674
CPHC share of joint ventures' equity (9,926,723)   (9,926,723)     (8,521,464)    
Net revenues from external customers 19,082,445 18,314,701 48,761,549 47,122,067        
Net loss 959,165 487,283 980,967 (139,333)        
Income (Loss) from Equity Method Investments (852,426) (936,264) (3,118,027) (3,899,029)        
CPHC's dividends received from joint ventures     (127,972) (55,943)        
Total Equity Method Investments [Member]                
Net revenues from external customers 3,225,038 2,586,763 8,834,255 5,844,648        
Net loss (2,974,849) (3,305,528) (10,905,768) (13,817,426)        
Income (Loss) from Equity Method Investments (852,426) (936,264) (3,118,027) (3,899,029)        
CPHC's dividends received from joint ventures (52,496) (18,648) (127,972) (55,943)        
Doran Canterbury I Joint Venture [Member]                
CPHC share of joint ventures' equity (9,160,000)   (9,160,000)     (7,755,000)    
Net revenues from external customers 1,461,928 838,253 3,575,866 1,282,339        
Net loss (1,306,239) (1,804,710) (5,126,481) (8,506,785)        
Income (Loss) from Equity Method Investments (357,909) (494,491) (1,404,656) (2,330,859)        
CPHC's dividends received from joint ventures 0 0 0 0        
Doran Canterbury II [Member]                
CPHC share of joint ventures' equity (767,000)   (767,000)     (766,000)    
Net revenues from external customers 1,623,845 1,617,245 4,840,677 4,403,472        
Net loss (1,544,862) (1,412,818) (5,354,043) (4,970,951)        
Income (Loss) from Equity Method Investments (423,292) (387,111) (1,467,008) (1,362,040)        
CPHC's dividends received from joint ventures 0 0 0 0        
Other Investment [Member]                
Net revenues from external customers 139,265 131,265 417,712 158,837        
Net loss (123,748)   (425,244)          
Income (Loss) from Equity Method Investments (71,225)   (246,363)          
CPHC's dividends received from joint ventures (52,496) (18,648) (127,972) (55,943)        
Other Investment 1 [Member]                
Income (Loss) from Equity Method Investments   (54,662)   (206,130)        
Total Equity Method Investments [Member]                
Current assets 5,958,680   5,958,680     6,306,889    
Noncurrent assets 133,873,298   133,873,298     139,607,148    
Current liabilities 75,867,040   75,867,040     77,028,627    
Noncurrent liabilities 87,979,946   87,979,946     89,001,340    
Joint ventures' equity (24,015,008)   (24,015,008)     (20,115,930)    
CPHC share of joint ventures' equity (5,141,012)   (5,141,012)     (3,365,820)    
Doran Canterbury I Joint Venture [Member]                
Current assets 4,096,237   4,096,237     5,779,528    
Noncurrent assets 51,109,961   51,109,961     53,053,492    
Current liabilities 71,502,530   71,502,530     72,325,450    
Noncurrent liabilities 16,249,461   16,249,461     14,567,290    
Joint ventures' equity (32,545,793)   (32,545,793)     (28,059,720)    
CPHC share of joint ventures' equity (9,159,909)   (9,159,909)     (7,755,253)    
Doran Canterbury II [Member]                
Current assets 1,737,728   1,737,728     456,519    
Noncurrent assets 69,780,166   69,780,166     72,925,034    
Current liabilities 4,327,346   4,327,346     4,693,064    
Noncurrent liabilities 66,560,935   66,560,935     69,259,050    
Joint ventures' equity 629,613   629,613     (570,561)    
CPHC share of joint ventures' equity (766,814)   (766,814)     (766,211)    
Other Investment [Member]                
Current assets 124,715   124,715     70,842    
Noncurrent assets 12,983,171   12,983,171     13,628,622    
Current liabilities 37,164   37,164     10,113    
Noncurrent liabilities 5,169,550   5,169,550     5,175,000    
Joint ventures' equity 7,901,172   7,901,172     8,514,351    
CPHC share of joint ventures' equity 4,785,711   4,785,711     $ 5,155,644    
Gross profit 59,294   162,727          
Total Equity Method Investments 1 [Member]                
Gross profit 1,835,095 1,306,952 4,295,081 1,997,172        
Doran Canterbury I Joint Venture 1 [Member]                
Gross profit 753,007 203,260 1,382,468 (827,418)        
Doran Canterbury II 1 [Member]                
Gross profit $ 1,022,794 1,051,087 $ 2,749,886 2,784,644        
Other Investment 1 [Member]                
Gross profit   52,605   39,946        
Net loss   $ (88,000)   $ (339,690)