v3.26.1
Note 7 - Real Estate Development - Summary of Equity Method Investments (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Dec. 31, 2024
Current assets $ 29,522,043   $ 29,522,043     $ 25,043,269    
Noncurrent assets 87,424,821   87,424,821     87,537,811    
Current liabilities 13,176,196   13,176,196     9,629,249    
Noncurrent liabilities 19,750,054   19,750,054     19,073,783    
Joint ventures' equity 84,020,614 $ 83,600,611 84,020,614 $ 83,600,611 $ 84,003,709 83,878,048 $ 83,748,340 $ 84,088,674
CPHC share of joint ventures' equity (9,145,521)   (9,145,521)     (8,521,464)    
Net revenues from external customers 16,167,746 15,665,734 29,677,279 28,807,366        
Net loss (148,074) (327,406) 21,803 (626,616)        
Income (Loss) from Equity Method Investments (1,048,807) (1,389,604) (2,265,601) (2,962,766)        
CPHC's dividends received from joint ventures     (75,473) (37,295)        
Total Equity Method Investments [Member]                
Net revenues from external customers 2,906,702 1,794,289 5,595,300 3,257,885        
Net loss (3,596,875) (4,901,805) (7,930,919) (10,511,900)        
Income (Loss) from Equity Method Investments (1,048,807) (1,389,604) (2,265,601) (2,962,766)        
CPHC's dividends received from joint ventures (37,732) (18,648) (75,473) (37,295)        
Doran Canterbury I Joint Venture [Member]                
CPHC share of joint ventures' equity (8,802,000)   (8,802,000)     (7,755,000)    
Net revenues from external customers 1,174,707 315,959 2,113,938 444,086        
Net loss (1,624,379) (3,064,630) (3,820,242) (6,702,075)        
Income (Loss) from Equity Method Investments (445,080) (839,709) (1,046,746) (1,836,369)        
CPHC's dividends received from joint ventures 0 0 0 0        
Doran Canterbury II [Member]                
CPHC share of joint ventures' equity (344,000)   (344,000)     (766,000)    
Net revenues from external customers 1,599,730 1,458,398 3,216,832 2,786,227        
Net loss (1,771,015) (1,689,910) (3,809,181) (3,558,133)        
Income (Loss) from Equity Method Investments (485,258) (463,035) (1,043,716) (974,928)        
CPHC's dividends received from joint ventures 0 0 0 0        
Other Investment [Member]                
Net revenues from external customers 132,265 19,932 264,530 27,572        
Net loss (201,481)   (301,496)          
Income (Loss) from Equity Method Investments (118,469)   (175,139)          
CPHC's dividends received from joint ventures (37,732) (18,648) (75,473) (37,295)        
Other Investment 1 [Member]                
Income (Loss) from Equity Method Investments   (86,860)   (151,469)        
Total Equity Method Investments [Member]                
Current assets 5,882,671   5,882,671     6,306,889    
Noncurrent assets 136,066,187   136,066,187     139,607,148    
Current liabilities 76,283,096   76,283,096     77,028,627    
Noncurrent liabilities 87,122,632   87,122,632     89,001,340    
Joint ventures' equity (21,456,870)   (21,456,870)     (20,115,930)    
CPHC share of joint ventures' equity (4,236,089)   (4,236,089)     (3,365,820)    
Doran Canterbury I Joint Venture [Member]                
Current assets 4,094,603   4,094,603     5,779,528    
Noncurrent assets 51,671,079   51,671,079     53,053,492    
Current liabilities 71,586,314   71,586,314     72,325,450    
Noncurrent liabilities 15,505,104   15,505,104     14,567,290    
Joint ventures' equity (31,325,736)   (31,325,736)     (28,059,720)    
CPHC share of joint ventures' equity (8,801,999)   (8,801,999)     (7,755,253)    
Doran Canterbury II [Member]                
Current assets 1,652,080   1,652,080     456,519    
Noncurrent assets 71,260,912   71,260,912     72,925,034    
Current liabilities 4,632,784   4,632,784     4,693,064    
Noncurrent liabilities 66,442,528   66,442,528     69,259,050    
Joint ventures' equity 1,837,680   1,837,680     (570,561)    
CPHC share of joint ventures' equity (343,522)   (343,522)     (766,211)    
Other Investment [Member]                
Current assets 135,988   135,988     70,842    
Noncurrent assets 13,134,196   13,134,196     13,628,622    
Current liabilities 63,998   63,998     10,113    
Noncurrent liabilities 5,175,000   5,175,000     5,175,000    
Joint ventures' equity 8,031,186   8,031,186     8,514,351    
CPHC share of joint ventures' equity 4,909,432   4,909,432     $ 5,155,644    
Gross profit 103,659   220,209          
Total Equity Method Investments 1 [Member]                
Gross profit 1,398,868 518,483 2,576,762 690,220        
Doran Canterbury I Joint Venture 1 [Member]                
Gross profit 432,888 (386,774) 629,461 (1,030,678)        
Doran Canterbury II 1 [Member]                
Gross profit $ 862,321 904,168 $ 1,727,092 1,733,557        
Other Investment 1 [Member]                
Gross profit   1,089   (12,659)        
Net loss   $ (147,265)   $ (251,692)