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Cover
Dec. 14, 2022
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Dec. 14, 2022
Entity File Number 001-33417
Entity Registrant Name Ocean Power Technologies, Inc.
Entity Central Index Key 0001378140
Entity Tax Identification Number 22-2535818
Entity Incorporation, State or Country Code DE
Entity Address, Address Line One 28 Engelhard Drive,
Entity Address, Address Line Two Suite B
Entity Address, City or Town Monroe Township,
Entity Address, State or Province NJ
Entity Address, Postal Zip Code 08831
City Area Code (609)
Local Phone Number 730-0400
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock, $0.001 Par Value
Trading Symbol OPTT
Security Exchange Name NYSE
Entity Emerging Growth Company false