Entity Address, City or Town Amendment Flag Legislation risk. Legislation Risk [Member] Auditor Firm ID Entity Incorporation, State or Country Code Entity Small Business Investing in shares risk. Investing In Shares Risk [Member] City Area Code Document Period End Date Income distribution to stockholder's risk. Income Distribution to Stockholder's Risk [Member] Inflation. Inflation [Member] Entity Address, Postal Zip Code Document Fiscal Period Focus Entity File Number Auditor Location Current Fiscal Year End Date Entity Address, Address Line One Document Annual Report United Kingdom’s Withdrawal from European Union United Kingdom Withdrawal from European Union [Member] Auditor Name Entity Filer Category Entity Current Reporting Status Impact on portfolio and value of investment due to global political and economic uncertainty. Impact on portfolio and value of investment due to global political and economic uncertainty [Member] ICFR Auditor Attestation Flag Documents Incorporated by Reference Entity Tax Identification Number Entity Emerging Growth Company Entity Voluntary Filers Document Transition Report Entity Common Stock, Shares Outstanding Entity Registrant Name Title of 12(b) Security Entity Address, State or Province Document Type Entity Shell Company Security Exchange Name Entity Central Index Key Impact of global capital market conditions. Impact of Global capital market conditions [Member] Entity Interactive Data Current Entity Public Float Local Phone Number Document Fiscal Year Focus Trading Symbol Entity Well-known Seasoned Issuer