Consolidated Statements of Stockholders' Equity - USD ($)	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Loss	Total
Balance (in shares) at Dec. 31, 2017	1,416,699
Balance at Dec. 31, 2017	$ 1,600	$ 14,780,100	$ 35,621,800	$ (3,036,800)	$ 0	$ 47,366,700
Acquisition of JHC by AeroCentury (in shares)	129,217
Acquisition of JHC by AeroCentury	$ 200	2,002,700				2,002,900
Common stock shares held by JHC prior to the acquisition of JHC and retained as treasury stock (in shares)	(32)
Common stock shares held by JHC prior to the acquisition of JHC and retained as treasury stock				(500)		(500)
Net loss			(8,081,200)			(8,081,200)
Accumulated other comprehensive loss						0
Balance (in shares) at Dec. 31, 2018	1,545,884
Balance at Dec. 31, 2018	$ 1,800	16,782,800	27,540,600	(3,037,300)	0	41,287,900
Net loss			(16,658,500)			(16,658,500)
Accumulated other comprehensive loss					(1,370,800)	(1,370,800)
Balance (in shares) at Dec. 31, 2019	1,545,884
Balance at Dec. 31, 2019	$ 1,800	$ 16,782,800	$ 10,882,100	$ (3,037,300)	$ (1,370,800)	$ 23,258,600