Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2020	Jun. 03, 2020
Document And Entity Information
Entity Registrant Name	AEROCENTURY CORP
Entity Central Index Key	0001036848
Document Type	10-Q
Document Period End Date	Mar. 31, 2020
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Is Entity's Reporting Status Current?	Yes
Is Entity Emerging Growth Company?	false
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		1,545,884
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2020
Entity Interactive Data Current	Yes
Entity Incorporation State Country Code	DE
Entity File Number	001-13387