Loans (Details) - USD ($)	Mar. 31, 2017	Dec. 31, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Jun. 30, 2015
Loans disclosures
Total loans	$ 223,646,779		$ 200,694,437
Deferred loan origination costs, net	597,880		562,483
Allowance for loan losses	(3,300,000)	$ (3,238,000)	(2,947,000)	$ (2,813,000)	$ (2,817,000)	$ (2,583,000)
Deferred loan origination costs and allowance	(2,702,120)		(2,384,517)
Loans, net	220,944,659		198,309,920
Commercial
Loans disclosures
Total loans	95,219,514		83,054,605
Allowance for loan losses	(1,522,000)	(1,468,000)	(1,337,000)	(1,212,000)	(1,225,000)	(1,124,000)
Commercial | Operating
Loans disclosures
Total loans	16,904,455		15,355,676
Commercial | Real Estate
Loans disclosures
Total loans	78,315,059		67,698,929
Agricultural
Loans disclosures
Total loans	52,649,996		47,908,101
Allowance for loan losses	(839,000)	(848,000)	(738,000)	(760,000)	(748,000)	(697,000)
Agricultural | Operating
Loans disclosures
Total loans	22,612,056		22,942,560
Agricultural | Real Estate
Loans disclosures
Total loans	30,037,940		24,965,541
Residential
Loans disclosures
Total loans	52,807,610		52,954,421
Allowance for loan losses	(616,000)	(635,000)	(655,000)	(665,000)	(672,000)	(644,000)
Residential | 1 - 4 family
Loans disclosures
Total loans	41,636,099		40,309,797
Residential | Consumer - Home equity and lines of credit
Loans disclosures
Total loans	11,171,511		12,644,624
Other
Loans disclosures
Total loans	22,969,659		16,777,310
Allowance for loan losses	(323,000)	$ (287,000)	(217,000)	$ (176,000)	$ (172,000)	$ (118,000)
Other | Construction and land
Loans disclosures
Total loans	19,161,346		13,210,393
Other | Consumer - Personal
Loans disclosures
Total loans	$ 3,808,313		$ 3,566,917