3.21.2 html 150 242 1 false 22 0 false 5 false false R1.htm 000 - Document - Document And Entity Information Sheet http://www.amerinst.bm/20210930/role/statement-document-and-entity-information Document And Entity Information Cover 1 false false R2.htm 001 - Statement - Condensed Consolidated Balance Sheets (Current Period Unaudited) Sheet http://www.amerinst.bm/20210930/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited Condensed Consolidated Balance Sheets (Current Period Unaudited) Statements 2 false false R3.htm 002 - Statement - Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) Sheet http://www.amerinst.bm/20210930/role/statement-condensed-consolidated-balance-sheets-current-period-unaudited-parentheticals Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) Statements 3 false false R4.htm 003 - Statement - Condensed Consolidated Statements of Operations, Comprehensive Loss and Retained Earnings (Unaudited) Sheet http://www.amerinst.bm/20210930/role/statement-condensed-consolidated-statements-of-operations-comprehensive-loss-and-retained-earnings-unaudited Condensed Consolidated Statements of Operations, Comprehensive Loss and Retained Earnings (Unaudited) Statements 4 false false R5.htm 004 - Statement - Condensed Consolidated Statements of Changes in Shareholders' Equity (Unaudited) Sheet http://www.amerinst.bm/20210930/role/statement-condensed-consolidated-statements-of-changes-in-shareholders-equity-unaudited Condensed Consolidated Statements of Changes in Shareholders' Equity (Unaudited) Statements 5 false false R6.htm 005 - Statement - Condensed Consolidated Statements of Cash Flows (Unaudited) Sheet http://www.amerinst.bm/20210930/role/statement-condensed-consolidated-statements-of-cash-flows-unaudited Condensed Consolidated Statements of Cash Flows (Unaudited) Statements 6 false false R7.htm 006 - Disclosure - Note 1 - Basis of Preparation and Consolidation Sheet http://www.amerinst.bm/20210930/role/statement-note-1-basis-of-preparation-and-consolidation Note 1 - Basis of Preparation and Consolidation Notes 7 false false R8.htm 007 - Disclosure - Note 2 - Investments Sheet http://www.amerinst.bm/20210930/role/statement-note-2-investments Note 2 - Investments Notes 8 false false R9.htm 008 - Disclosure - Note 3 - Liability for Unpaid Losses and Loss Adjustment Expenses Sheet http://www.amerinst.bm/20210930/role/statement-note-3-liability-for-unpaid-losses-and-loss-adjustment-expenses Note 3 - Liability for Unpaid Losses and Loss Adjustment Expenses Notes 9 false false R10.htm 009 - Disclosure - Note 4 - Segment Information Sheet http://www.amerinst.bm/20210930/role/statement-note-4-segment-information Note 4 - Segment Information Notes 10 false false R11.htm 010 - Disclosure - Note 5 - Stock Compensation Sheet http://www.amerinst.bm/20210930/role/statement-note-5-stock-compensation Note 5 - Stock Compensation Notes 11 false false R12.htm 011 - Disclosure - Note 6 - Subsequent Event Sheet http://www.amerinst.bm/20210930/role/statement-note-6-subsequent-event- Note 6 - Subsequent Event Notes 12 false false R13.htm 012 - Disclosure - Note 2 - Investments (Tables) Sheet http://www.amerinst.bm/20210930/role/statement-note-2-investments-tables Note 2 - Investments (Tables) Tables http://www.amerinst.bm/20210930/role/statement-note-2-investments 13 false false R14.htm 013 - Disclosure - Note 3 - Liability for Unpaid Losses and Loss Adjustment Expenses (Tables) Sheet http://www.amerinst.bm/20210930/role/statement-note-3-liability-for-unpaid-losses-and-loss-adjustment-expenses-tables Note 3 - Liability for Unpaid Losses and Loss Adjustment Expenses (Tables) Tables http://www.amerinst.bm/20210930/role/statement-note-3-liability-for-unpaid-losses-and-loss-adjustment-expenses 14 false false R15.htm 014 - Disclosure - Note 4 - Segment Information (Tables) Sheet http://www.amerinst.bm/20210930/role/statement-note-4-segment-information-tables Note 4 - Segment Information (Tables) Tables http://www.amerinst.bm/20210930/role/statement-note-4-segment-information 15 false false R16.htm 015 - Disclosure - Note 5 - Stock Compensation (Tables) Sheet http://www.amerinst.bm/20210930/role/statement-note-5-stock-compensation-tables Note 5 - Stock Compensation (Tables) Tables http://www.amerinst.bm/20210930/role/statement-note-5-stock-compensation 16 false false R17.htm 016 - Disclosure - Note 1 - Basis of Preparation and Consolidation (Details Textual) Sheet http://www.amerinst.bm/20210930/role/statement-note-1-basis-of-preparation-and-consolidation-details-textual Note 1 - Basis of Preparation and Consolidation (Details Textual) Details http://www.amerinst.bm/20210930/role/statement-note-1-basis-of-preparation-and-consolidation 17 false false R18.htm 017 - Disclosure - Note 2 - Investments (Details Textual) Sheet http://www.amerinst.bm/20210930/role/statement-note-2-investments-details-textual Note 2 - Investments (Details Textual) Details http://www.amerinst.bm/20210930/role/statement-note-2-investments-tables 18 false false R19.htm 018 - Disclosure - Note 2 - Investments - Cost or Amortized Cost, Gross Unrealized Holding Gains and Losses, and Estimated Fair Value of Fixed Maturity Investments (Details) Sheet http://www.amerinst.bm/20210930/role/statement-note-2-investments-cost-or-amortized-cost-gross-unrealized-holding-gains-and-losses-and-estimated-fair-value-of-fixed-maturity-investments-details Note 2 - Investments - Cost or Amortized Cost, Gross Unrealized Holding Gains and Losses, and Estimated Fair Value of Fixed Maturity Investments (Details) Details 19 false false R20.htm 019 - Disclosure - Note 2 - Investments - Fixed Maturity and Securities in an Unrealized Loss Position and Aggregate Fair Value and Gross Unrealized Loss (Details) Sheet http://www.amerinst.bm/20210930/role/statement-note-2-investments-fixed-maturity-and-securities-in-an-unrealized-loss-position-and-aggregate-fair-value-and-gross-unrealized-loss-details Note 2 - Investments - Fixed Maturity and Securities in an Unrealized Loss Position and Aggregate Fair Value and Gross Unrealized Loss (Details) Details 20 false false R21.htm 020 - Disclosure - Note 2 - Investments - Fair Value of Investments (Details) Sheet http://www.amerinst.bm/20210930/role/statement-note-2-investments-fair-value-of-investments-details Note 2 - Investments - Fair Value of Investments (Details) Details 21 false false R22.htm 021 - Disclosure - Note 2 - Investments - Cost or Amortized Cost and Estimated Fair Value of Fixed Maturity Investments (Details) Sheet http://www.amerinst.bm/20210930/role/statement-note-2-investments-cost-or-amortized-cost-and-estimated-fair-value-of-fixed-maturity-investments-details Note 2 - Investments - Cost or Amortized Cost and Estimated Fair Value of Fixed Maturity Investments (Details) Details 22 false false R23.htm 022 - Disclosure - Note 2 - Investments - Sales and Maturities of Investments (Details) Sheet http://www.amerinst.bm/20210930/role/statement-note-2-investments-sales-and-maturities-of-investments-details Note 2 - Investments - Sales and Maturities of Investments (Details) Details 23 false false R24.htm 023 - Disclosure - Note 2 - Investments - Major Categories of Net Interest and Dividend Income (Details) Sheet http://www.amerinst.bm/20210930/role/statement-note-2-investments-major-categories-of-net-interest-and-dividend-income-details Note 2 - Investments - Major Categories of Net Interest and Dividend Income (Details) Details 24 false false R25.htm 024 - Disclosure - Note 3 - Liability for Unpaid Losses and Loss Adjustment Expenses (Details Textual) Sheet http://www.amerinst.bm/20210930/role/statement-note-3-liability-for-unpaid-losses-and-loss-adjustment-expenses-details-textual Note 3 - Liability for Unpaid Losses and Loss Adjustment Expenses (Details Textual) Details http://www.amerinst.bm/20210930/role/statement-note-3-liability-for-unpaid-losses-and-loss-adjustment-expenses-tables 25 false false R26.htm 025 - Disclosure - Note 3 - Liability for Unpaid Losses and Loss Adjustment Expenses - Liability for Losses and Loss Adjustment Expense Activity (Details) Sheet http://www.amerinst.bm/20210930/role/statement-note-3-liability-for-unpaid-losses-and-loss-adjustment-expenses-liability-for-losses-and-loss-adjustment-expense-activity-details Note 3 - Liability for Unpaid Losses and Loss Adjustment Expenses - Liability for Losses and Loss Adjustment Expense Activity (Details) Details 26 false false R27.htm 026 - Disclosure - Note 4 - Segment Information (Details Textual) Sheet http://www.amerinst.bm/20210930/role/statement-note-4-segment-information-details-textual Note 4 - Segment Information (Details Textual) Details http://www.amerinst.bm/20210930/role/statement-note-4-segment-information-tables 27 false false R28.htm 027 - Disclosure - Note 4 - Segment Information - Segment Reporting Information (Details) Sheet http://www.amerinst.bm/20210930/role/statement-note-4-segment-information-segment-reporting-information-details Note 4 - Segment Information - Segment Reporting Information (Details) Details 28 false false R29.htm 028 - Disclosure - Note 5 - Stock Compensation (Details Textual) Sheet http://www.amerinst.bm/20210930/role/statement-note-5-stock-compensation-details-textual Note 5 - Stock Compensation (Details Textual) Details http://www.amerinst.bm/20210930/role/statement-note-5-stock-compensation-tables 29 false false R30.htm 029 - Disclosure - Note 5 - Stock Compensation - Summary of Vested Phantom Shares (Details) Sheet http://www.amerinst.bm/20210930/role/statement-note-5-stock-compensation-summary-of-vested-phantom-shares-details Note 5 - Stock Compensation - Summary of Vested Phantom Shares (Details) Details 30 false false R31.htm 030 - Disclosure - Note 5 - Stock Compensation - Summary of the Status of the Stock Option Plan (Details) Sheet http://www.amerinst.bm/20210930/role/statement-note-5-stock-compensation-summary-of-the-status-of-the-stock-option-plan-details Note 5 - Stock Compensation - Summary of the Status of the Stock Option Plan (Details) Details 31 false false All Reports Book All Reports aigltd20210930_10q.htm aigt-20210930.xsd aigt-20210930_cal.xml aigt-20210930_def.xml aigt-20210930_lab.xml aigt-20210930_pre.xml ex_303782.htm ex_303783.htm ex_303784.htm ex_303785.htm http://xbrl.sec.gov/dei/2021 http://fasb.org/us-gaap/2021-01-31 http://fasb.org/srt/2021-01-31 true true