PARENT-ONLY FINANCIAL INFORMATION - Condensed statements of cash flows (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities
Net changes in other liabilities	$ 201,487	$ 434,135
Net cash provided by operating activities	5,175,045	5,804,060
Cash flows from investing activities
Net (increase) decrease in loans	38,476,501	(19,587,498)
Net cash provided by (used in) investing activities	35,933,286	(22,252,576)
Cash flows from financing activities
Repurchase of common stock	(481,468)
Net cash used in financing activities	(16,425,285)	(31,028,304)
Net increase (decrease) in cash and cash equivalents	24,683,046	(47,476,820)
Cash and cash equivalents – beginning of year	80,385,739	127,862,559
Cash and cash equivalents – end of year	105,068,785	80,385,739
Parent Company [Member]
Cash flows from operating activities
Net income before undistributed earnings of subsidiaries	7,520,000
Undistibuted earnings of subsidiaries	(7,769,000)
Net changes in other liabilities	(11,000)
Net cash provided by operating activities	(260,000)
Cash flows from investing activities
Net (increase) decrease in loans	195,000
Net cash provided by (used in) investing activities	195,000
Cash flows from financing activities
Repurchase of common stock	(482,000)
Net cash used in financing activities	(482,000)
Net increase (decrease) in cash and cash equivalents	(547,000)
Cash and cash equivalents – beginning of year	21,283,000
Cash and cash equivalents – end of year	$ 20,736,000	$ 21,283,000