3.26.1 html 8 89 1 false 1 0 false 3 false false R1.htm 000 - Document - Document And Entity Information Sheet http://www.fstcorp.com/role/DocumentAndEntityInformation Document And Entity Information Cover 1 false false R2.htm 001 - Statement - Consolidated Balance Sheets Sheet http://www.fstcorp.com/role/ConsolidatedBalanceSheet Consolidated Balance Sheets Statements 2 false false R3.htm 002 - Statement - Consolidated Balance Sheets (Parentheticals) Sheet http://www.fstcorp.com/role/ConsolidatedBalanceSheet_Parentheticals Consolidated Balance Sheets (Parentheticals) Statements 3 false false R4.htm 003 - Statement - Unaudited Condensed Consolidated Statements of Operations and Comprehensive Loss Sheet http://www.fstcorp.com/role/ConsolidatedIncomeStatement Unaudited Condensed Consolidated Statements of Operations and Comprehensive Loss Statements 4 false false R5.htm 004 - Statement - Unaudited Condensed Consolidated Statements of Cash Flows Sheet http://www.fstcorp.com/role/ConsolidatedCashFlow Unaudited Condensed Consolidated Statements of Cash Flows Statements 5 false false All Reports Book All Reports ea0288097-6k_fstcorp.htm ea028809701ex99-1.htm kbsx-20260331.xsd kbsx-20260331_cal.xml kbsx-20260331_def.xml kbsx-20260331_lab.xml kbsx-20260331_pre.xml http://fasb.org/us-gaap/2025 http://xbrl.sec.gov/dei/2025 true true