5. Loans, Allowance for Loan Losses and Credit Quality (Details 4) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Recorded investment with an allowance recorded	$ 1,284,362	$ 1,075,557	$ 1,284,362	$ 1,075,557	$ 949,636
Unpaid principal balance with an allowance recorded	1,407,139	1,121,699	1,407,139	1,121,699	970,615
Related allowance with an allowance recorded	205,180	224,099	205,180	224,099	114,726
Average recorded investment with an allowance recorded	1,177,547	936,413	1,177,877	977,015	971,539
Interest income recognized with an allowance recorded			70,776	47,292	45,490
Recorded investment with no related allowance recorded	6,466,313	5,765,922	6,466,313	5,765,922	5,586,358
Unpaid principal balance with no related allowance recorded	7,731,309	6,542,749	7,731,309	6,542,749	6,490,501
Average recorded investment with no related allowance recorded	6,750,981	5,934,773	6,183,345	5,501,486	5,518,460
Interest income recognized with no related allowance recorded			181,574	237,112	107,444
Recorded investment allowance recorded	7,750,675	6,841,479	7,750,675	6,841,479	6,535,994
Unpaid principal balance allowance recorded	9,138,448	7,664,448	9,138,448	7,664,448	7,461,116
Average recorded investment allowance recorded	7,928,528	6,871,186	7,361,222	6,478,501	6,489,999
Interest income recognized			252,350	284,404	152,934
Commercial and industrial
Recorded investment with an allowance recorded	162,330		162,330
Unpaid principal balance with an allowance recorded	162,330		162,330
Related allowance with an allowance recorded	95,945		95,945
Average recorded investment with an allowance recorded	81,165		40,583	0
Interest income recognized with an allowance recorded			0	0
Recorded investment with no related allowance recorded	407,841	62,879	407,841	62,879	60,846
Unpaid principal balance with no related allowance recorded	426,051	82,267	426,051	82,267	80,894
Average recorded investment with no related allowance recorded	507,336	129,979	278,776	135,944	120,924
Interest income recognized with no related allowance recorded			4,077	0	0
Commercial Real Estate
Recorded investment with an allowance recorded	0	0	0	0	0
Unpaid principal balance with an allowance recorded	0	0	0	0	0
Related allowance with an allowance recorded	0	0	0	0	0
Average recorded investment with an allowance recorded	0	0	122,150	72,073	57,658
Interest income recognized with an allowance recorded			0	0	0
Recorded investment with no related allowance recorded	1,849,859	1,879,357	1,849,859	1,879,357	1,748,323
Unpaid principal balance with no related allowance recorded	2,273,987	2,082,229	2,273,987	2,082,229	1,975,831
Average recorded investment with no related allowance recorded	1,951,505	1,972,312	1,841,103	1,642,662	1,663,794
Interest income recognized with no related allowance recorded			13,223	56,857	13,131
Residential real estate - 1st lien
Recorded investment with an allowance recorded	1,114,686	857,688	1,114,686	857,688	942,365
Unpaid principal balance with an allowance recorded	1,135,476	900,987	1,135,476	900,987	963,367
Related allowance with an allowance recorded	107,526	141,863	107,526	141,863	112,969
Average recorded investment with an allowance recorded	1,089,372	823,580	1,008,088	809,816	836,326
Interest income recognized with an allowance recorded			70,281	46,721	45,139
Recorded investment with no related allowance recorded	4,035,429	3,671,955	4,035,429	3,671,955	3,465,117
Unpaid principal balance with no related allowance recorded	4,808,932	4,225,575	4,808,932	4,225,575	4,082,637
Average recorded investment with no related allowance recorded	4,108,857	3,607,829	3,819,787	3,505,936	3,497,772
Interest income recognized with no related allowance recorded			164,274	180,255	94,313
Residential real estate - Jr lien
Recorded investment with an allowance recorded	7,346	217,869	7,346	217,869	7,271
Unpaid principal balance with an allowance recorded	109,333	220,712	109,333	220,712	7,248
Related allowance with an allowance recorded	1,709	82,236	1,709	82,236	1,757
Average recorded investment with an allowance recorded	7,010	112,833	7,056	95,126	77,555
Interest income recognized with an allowance recorded			495	571	351
Recorded investment with no related allowance recorded	173,184	151,731	173,184	151,731	312,072
Unpaid principal balance with no related allowance recorded	222,339	152,678	222,339	152,678	351,139
Average recorded investment with no related allowance recorded	$ 183,283	$ 224,653	243,679	216,944	235,970
Interest income recognized with no related allowance recorded			$ 0	$ 0	$ 0