LOANS - Summary of allowance for loan losses and the recorded investment in loans by portfolio segments (Detail) - USD ($)	Jun. 30, 2023	Mar. 31, 2023	Jan. 01, 2023	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Financing Receivable, Past Due [Line Items]
Individually evaluated for impairment				$ 33,000
Collectively evaluated for impairment				2,545,174
Total ending allowance balance	$ 2,785,949	$ 2,860,949	$ 2,860,949	2,578,174	$ 2,253,174	$ 2,153,174	$ 2,153,174
Loans individually evaluated for impairment				856,659
Loans collectively evaluated for impairment				716,526,580
Loans acquired with deteriorated credit quality				4,220,697
Total ending loan balance	708,732,034		721,729,711	721,603,936
Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
Individually evaluated for impairment	10,937,811
Total ending allowance balance				3,960
Commercial Real Estate Portfolio Segment | Residential First Mortgage
Financing Receivable, Past Due [Line Items]
Individually evaluated for impairment				33,000
Collectively evaluated for impairment				1,569,534
Total ending allowance balance	1,811,547	1,914,947	1,814,203	1,602,534	1,251,924	1,092,474	1,092,474
Loans individually evaluated for impairment				819,590
Loans collectively evaluated for impairment				462,439,940
Loans acquired with deteriorated credit quality				2,841,097
Total ending loan balance	488,571,980		495,689,840	466,100,627
Commercial Real Estate Portfolio Segment | Commercial and Multi-Family Real Estate
Financing Receivable, Past Due [Line Items]
Collectively evaluated for impairment				615,480
Total ending allowance balance	539,002			615,480	680,000	768,600	768,600
Loans collectively evaluated for impairment				160,990,186
Loans acquired with deteriorated credit quality				1,348,483
Total ending loan balance				162,338,669
Commercial Real Estate Portfolio Segment | Construction
Financing Receivable, Past Due [Line Items]
Individually evaluated for impairment	10,937,811
Collectively evaluated for impairment				258,500
Total ending allowance balance	159,000	241,000	260,000	258,500	232,000	195,000	195,000
Loans collectively evaluated for impairment				61,825,478
Total ending loan balance	48,678,332		61,825,478	61,825,478
Commercial Real Estate Portfolio Segment | Home Equity and Other
Financing Receivable, Past Due [Line Items]
Total ending allowance balance				97,700
Commercial Portfolio Segment
Financing Receivable, Past Due [Line Items]
Collectively evaluated for impairment				3,960
Total ending allowance balance	11,400	$ 4,000	(4,000)	3,960	7,000	9,400	9,400
Loans collectively evaluated for impairment				1,684,189
Total ending loan balance	3,692,425		$ 1,684,189	1,684,189
Commercial Portfolio Segment | Construction
Financing Receivable, Past Due [Line Items]
Total ending allowance balance	159,000
Consumer
Financing Receivable, Past Due [Line Items]
Total ending allowance balance	$ 11,400
Consumer | Home Equity and Other
Financing Receivable, Past Due [Line Items]
Collectively evaluated for impairment				97,700
Total ending allowance balance				97,700	$ 82,250	$ 87,700	$ 87,700
Loans individually evaluated for impairment				37,069
Loans collectively evaluated for impairment				29,586,787
Loans acquired with deteriorated credit quality				31,117
Total ending loan balance				$ 29,654,973