Note 1 - The Company (Details Textual)			3 Months Ended	12 Months Ended
Note 1 - The Company (Details Textual)	Dec. 17, 2018	Apr. 18, 2011	Mar. 31, 2025 USD ($)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2024 USD ($)
Operations Commenced Date		Apr. 18, 2011
Investment Owned, Net Assets, Percentage			83.40%			100.00%
Investment Owned, Fair Value			$ 698,169			$ 1,060,474
Cayman Subsidiaries [Member]
Number of Subsidiaries	3
Subsidiaries [Member]
Number of Subsidiaries				3	3
Product Concentration Risk [Member] \| Revenue Benchmark [Member] \| Technology Sector [Member]
Concentration Risk, Percentage			50.00%
Minimum [Member] \| Technology Sector [Member]
Investment Owned, Fair Value			$ 1,000,000
Maximum [Member] \| Technology Sector [Member]
Investment Owned, Fair Value			10,000,000
Investment, Affiliated Issuer, Controlled [Member]
Investment Owned, Fair Value			$ 36,850			$ 54,753
Technology Companies [Member] \| Investment, Affiliated Issuer, Controlled [Member] \| Minimum [Member]
Investment Owned, Net Assets, Percentage			80.00%
Small-cap Stocks Companies [Member] \| Investment, Affiliated Issuer, Controlled [Member] \| Minimum [Member]
Investment Owned, Net Assets, Percentage			70.00%

Firsthand Technology Value Fund, Inc. 10-Q