SECURITIES HELD TO MATURITY - Summary of debt securities held to maturity and unrealized loss position (Detail) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Marketable Securities [Line Items]
Fair Value, Less Than 12 Months	$ 21,010,647	$ 7,240,085
Unrealized Losses, Less Than 12 Months	(647,141)	(77,143)
Fair Value, 12 Months or More	92,383
Unrealized Losses, 12 Months or More	(1,265)
Fair Value, Total	21,103,030	7,240,085
Unrealized Losses, Total	(648,406)	(77,143)
Corporate Bonds
Marketable Securities [Line Items]
Fair Value, Less Than 12 Months	4,622,644	747,480
Unrealized Losses, Less Than 12 Months	(64,463)	(2,520)
Fair Value, Total	4,622,644	747,480
Unrealized Losses, Total	(64,463)	(2,520)
U.S. Government-sponsored Agencies
Marketable Securities [Line Items]
Fair Value, Less Than 12 Months	2,000,000
Unrealized Losses, Less Than 12 Months	(439)
Fair Value, Total	2,000,000
Unrealized Losses, Total	(439)
Municipal Bonds
Marketable Securities [Line Items]
Fair Value, Less Than 12 Months		1,436,454
Unrealized Losses, Less Than 12 Months		(141)
Fair Value, Total		1,436,454
Unrealized Losses, Total		(141)
MBSs - residential
Marketable Securities [Line Items]
Fair Value, Less Than 12 Months	8,109,272	2,403,485
Unrealized Losses, Less Than 12 Months	(370,378)	(15,440)
Fair Value, 12 Months or More	92,383
Unrealized Losses, 12 Months or More	(1,265)
Fair Value, Total	8,201,655	2,403,485
Unrealized Losses, Total	(371,643)	(15,440)
MBSs commercial
Marketable Securities [Line Items]
Fair Value, Less Than 12 Months	6,278,731	2,652,666
Unrealized Losses, Less Than 12 Months	(211,861)	(59,042)
Fair Value, Total	6,278,731	2,652,666
Unrealized Losses, Total	$ (211,861)	$ (59,042)