Note 19 - Fair Values of Financial Instruments - Significant Unobservable Inputs (Details)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Impaired loans, fair value disclosure	$ 3,643,608	$ 5,436,972
Commercial Real Estate Portfolio Segment [Member]
Impaired loans, fair value disclosure	2,993,923	3,483,078
One-to-four Family Residential Real Estate Portfolio Segment [Member]
Impaired loans, fair value disclosure	649,685	679,184
Commercial and Industrial Portfolio Segment [Member]
Impaired loans, fair value disclosure		1,274,710
Fair Value, Measurements, Nonrecurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Impaired loans, fair value disclosure	3,643,608	5,436,972
Fair Value, Measurements, Nonrecurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Valuation, Market Approach [Member] \| Commercial Real Estate Portfolio Segment [Member]
Impaired loans, fair value disclosure	$ 2,993,923	$ 3,483,078
Fair Value, Measurements, Nonrecurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Valuation, Market Approach [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Minimum [Member] \| Measurement Input, Discount Rate [Member]
Impaired loans, Unobservable input valuation	0.17	0.17
Fair Value, Measurements, Nonrecurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Valuation, Market Approach [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Maximum [Member] \| Measurement Input, Discount Rate [Member]
Impaired loans, Unobservable input valuation	0.18	0.18
Fair Value, Measurements, Nonrecurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Valuation, Market Approach [Member] \| One-to-four Family Residential Real Estate Portfolio Segment [Member]
Impaired loans, fair value disclosure	$ 649,685	$ 679,184
Fair Value, Measurements, Nonrecurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Valuation, Market Approach [Member] \| One-to-four Family Residential Real Estate Portfolio Segment [Member] \| Minimum [Member] \| Measurement Input, Discount Rate [Member]
Impaired loans, Unobservable input valuation	0.17	0.17
Fair Value, Measurements, Nonrecurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Valuation, Market Approach [Member] \| One-to-four Family Residential Real Estate Portfolio Segment [Member] \| Maximum [Member] \| Measurement Input, Discount Rate [Member]
Impaired loans, Unobservable input valuation	0.18	0.18
Fair Value, Measurements, Nonrecurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Valuation, Market Approach [Member] \| Commercial and Industrial Portfolio Segment [Member]
Impaired loans, fair value disclosure		$ 1,274,710
Fair Value, Measurements, Nonrecurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Valuation, Market Approach [Member] \| Commercial and Industrial Portfolio Segment [Member] \| Minimum [Member] \| Measurement Input, Discount Rate [Member]
Impaired loans, Unobservable input valuation	0.17	0.17
Fair Value, Measurements, Nonrecurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Valuation, Market Approach [Member] \| Commercial and Industrial Portfolio Segment [Member] \| Maximum [Member] \| Measurement Input, Discount Rate [Member]
Impaired loans, Unobservable input valuation	0.18	0.18
Fair Value, Measurements, Nonrecurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Internal Estimate [member]
Derivative IRLC's, fair value disclosure	$ 380,866	$ 183,087
Derivative IRLC's, Unobservable input valuation		0.81
Fair Value, Measurements, Nonrecurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Internal Estimate [member] \| Measurement Input, Pull-through Rate [Member]
Derivative IRLC's, Unobservable input valuation	0.77

Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Commercial Real Estate Portfolio Segment [Member]

Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | One-to-four Family Residential Real Estate Portfolio Segment [Member]

Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Commercial and Industrial Portfolio Segment [Member]

Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Internal Estimate [member]

Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Internal Estimate [member] | Measurement Input, Pull-through Rate [Member]