Note 9 - Borrowings - Outstanding Advances (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Advances from FHLB	$ 9,100,000	$ 12,100,000
Federal Home Loan Bank of Chicago [Member]
Advances from FHLB	9,068,030	12,087,152
Federal Home Loan Bank of Chicago [Member] | Matures 03/15/2019 at 2.42% [Member]
Advances from FHLB		1,500,000
Federal Home Loan Bank of Chicago [Member] | Matures 04/01/2019 at 2.00% [Member]
Advances from FHLB		499,272
Federal Home Loan Bank of Chicago [Member] | Matures 08/30/2019 at 1.56% [Member]
Advances from FHLB		3,000,000
Federal Home Loan Bank of Chicago [Member] | Matures 12/16/2019 at 2.08% [Member]
Advances from FHLB		2,000,000
Federal Home Loan Bank of Chicago [Member] | Matures 03/22/2021 at 3.03% [Member]
Advances from FHLB	1,000,000	1,000,000
Federal Home Loan Bank of Chicago [Member] | Matures 09/21/2021 at 3.07% [Member]
Advances from FHLB	1,000,000	1,000,000
Federal Home Loan Bank of Chicago [Member] | Matures 03/21/2022 at 3.09% [Member]
Advances from FHLB	1,000,000	1,000,000
Federal Home Loan Bank of Chicago [Member] | Matures 09/21/2022 at 3.11% [Member]
Advances from FHLB	1,000,000	1,000,000
Federal Home Loan Bank of Chicago [Member] | Matures 10/03/2022 at 1.48% [Member]
Advances from FHLB	68,030	87,880
Federal Home Loan Bank of Chicago [Member] | Matures 03/21/2023 at 3.15% [Member]
Advances from FHLB	500,000	500,000
Federal Home Loan Bank of Chicago [Member] | Matures 09/21/2023 at 3.18 % [Member]
Advances from FHLB	500,000	500,000
Federal Home Loan Bank of Chicago [Member] | Matures 08/28/2024 at 1.59% [Member]
Advances from FHLB	1,500,000
Federal Home Loan Bank of Chicago [Member] | Matures 08/28/2029 at 1.93% [Member]
Advances from FHLB	1,500,000
Federal Home Loan Bank of Chicago [Member] | Matures 10/23/2029 at 1.96% [Member]
Advances from FHLB	$ 1,000,000