Note 11 - Borrowings - Outstanding Advances (Details) - Federal Home Loan Bank of Chicago [Member] - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Advances from FHLB	$ 17,577,635	$ 12,087,152
Matures 03/15/2019 at 2.42% [Member]
Advances from FHLB		1,500,000
Matures 04/01/2019 at 2.00% [Member]
Advances from FHLB		499,272
Matures 07/11/2019 at 2.43% [Member]
Advances from FHLB	2,500,000
Matures 07/22/2019 at 2.43% [Member]
Advances from FHLB	1,000,000
Matures 07/26/2019 at 2.45% [Member]
Advances from FHLB	2,500,000
Matures 08/12/2019 at 2.43% [Member]
Advances from FHLB	1,500,000
Matures 08/30/2019 at 1.56% [Member]
Advances from FHLB	3,000,000	3,000,000
Matures 12/16/2019 at 2.08% [Member]
Advances from FHLB	2,000,000	2,000,000
Matures 03/22/2021 at 3.03% [Member]
Advances from FHLB	1,000,000	1,000,000
Matures 09/21/2021 at 3.07% [Member]
Advances from FHLB	1,000,000	1,000,000
Matures 03/21/2022 at 3.09% [Member]
Advances from FHLB	1,000,000	1,000,000
Matures 09/21/2022 at 3.11% [Member]
Advances from FHLB	1,000,000	1,000,000
Matures 10/03/2022 at 1.48% [Member]
Advances from FHLB	77,635	87,880
Matures 03/21/2023 at 3.15% [Member]
Advances from FHLB	500,000	500,000
Matures 09/21/2023 at 3.18 % [Member]
Advances from FHLB	$ 500,000	$ 500,000