v3.26.1
Average Annual Total Returns
 12 Months Ended 60 Months Ended 120 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Firsthand Technology Opportunities Fund | Firsthand Technology Opportunities Fund      
Prospectus [Line Items]      
Average Annual Return, Percent 29.47% (17.83%) 4.98%
Firsthand Technology Opportunities Fund | Firsthand Technology Opportunities Fund | After Taxes on Distributions      
Prospectus [Line Items]      
Average Annual Return, Percent 29.47% (19.52%) 2.84%
Firsthand Technology Opportunities Fund | Firsthand Technology Opportunities Fund | After Taxes on Distributions and Sales      
Prospectus [Line Items]      
Average Annual Return, Percent 17.45% (12.00%) 4.34%
Firsthand Technology Opportunities Fund | Firsthand Technology Opportunities Fund | S P 500 Total Index [Member]      
Prospectus [Line Items]      
Average Annual Return, Percent 17.88% 14.42% 14.82%
Firsthand Technology Opportunities Fund | Firsthand Technology Opportunities Fund | Nasdaq Composite Index 1 [Member]      
Prospectus [Line Items]      
Average Annual Return, Percent 21.14% 13.35% 17.66%
Firsthand Alternative Energy Fund | Firsthand Alternative Energy Fund      
Prospectus [Line Items]      
Average Annual Return, Percent 21.78% (2.97%) 7.66%
Firsthand Alternative Energy Fund | Firsthand Alternative Energy Fund | After Taxes on Distributions      
Prospectus [Line Items]      
Average Annual Return, Percent 18.04% (3.97%) 7.20%
Firsthand Alternative Energy Fund | Firsthand Alternative Energy Fund | After Taxes on Distributions and Sales      
Prospectus [Line Items]      
Average Annual Return, Percent 15.54% (2.24%) 6.23%
Firsthand Alternative Energy Fund | Firsthand Alternative Energy Fund | S P 500 Total Index [Member]      
Prospectus [Line Items]      
Average Annual Return, Percent 17.88% 14.42% 14.82%
Firsthand Alternative Energy Fund | Firsthand Alternative Energy Fund | Nasdaq Composite Index 1 [Member]      
Prospectus [Line Items]      
Average Annual Return, Percent 21.14% 13.35% 17.66%
Firsthand Alternative Energy Fund | Firsthand Alternative Energy Fund | Wilder Hill Clean Energy Index [Member]      
Prospectus [Line Items]      
Average Annual Return, Percent 53.00% (21.16%) 3.19%