Note 12 - Fair Value Measurements - Valuation and Unobservable Inputs for Level 3 Assets (Details)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)
Fair Value, Measurements, Nonrecurring [Member]
Impaired Loans, Net of Allowance, Fair Value Disclosure, Nonrecurring	$ 11,554,069	$ 8,454,083
Foreclosed Real Estate, Fair Value Disclosure, Nonrecurring	457,778	457,778
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Measurements, Nonrecurring [Member]
Impaired Loans, Net of Allowance, Fair Value Disclosure, Nonrecurring	11,554,069	8,454,083
Foreclosed Real Estate, Fair Value Disclosure, Nonrecurring	457,778	$ 457,778
Fair Value, Inputs, Level 3 [Member] \| Valuation, Market Approach [Member] \| Fair Value, Measurements, Recurring [Member]
Investment securities, fair value	$ 1,983,250
Fair Value, Inputs, Level 3 [Member] \| Valuation, Market Approach [Member] \| Fair Value, Measurements, Recurring [Member] \| Minimum [Member] \| Measurement Input, Discount Rate [Member]
Investment securities, discount rate	0
Impaired loans, net of allowance, discount rate	0
Fair Value, Inputs, Level 3 [Member] \| Valuation, Market Approach [Member] \| Fair Value, Measurements, Recurring [Member] \| Maximum [Member] \| Measurement Input, Discount Rate [Member]
Investment securities, discount rate	0.1
Impaired loans, net of allowance, discount rate	0.25
Fair Value, Inputs, Level 3 [Member] \| Valuation, Market Approach [Member] \| Fair Value, Measurements, Nonrecurring [Member]
Impaired Loans, Net of Allowance, Fair Value Disclosure, Nonrecurring	$ 11,554,069
Foreclosed Real Estate, Fair Value Disclosure, Nonrecurring	$ 457,778
Fair Value, Inputs, Level 3 [Member] \| Valuation, Market Approach [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Minimum [Member] \| Measurement Input, Discount Rate [Member]
Foreclosed real estate, discount rate	0
Fair Value, Inputs, Level 3 [Member] \| Valuation, Market Approach [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Maximum [Member] \| Measurement Input, Discount Rate [Member]
Foreclosed real estate, discount rate	0.25
Fair Value, Inputs, Level 3 [Member] \| Valuation Technique, Discounted Cash Flow [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Minimum [Member] \| Measurement Input, Discount Rate [Member]
Impaired loans, net of allowance, discount rate	0.0263
Fair Value, Inputs, Level 3 [Member] \| Valuation Technique, Discounted Cash Flow [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Maximum [Member] \| Measurement Input, Discount Rate [Member]
Impaired loans, net of allowance, discount rate	0.0725

Value of input used to measure foreclosed real estate.

No definition available.

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- Definition

The fair value of impaired loans that are net of allowance.

+ References

No definition available.

+ Details

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- Definition

Value of input used to measure impaired loans, net of allowance.

+ References

No definition available.

+ Details

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- Definition

The fair value of real estate that acquired through foreclosure.

+ References

No definition available.

+ Details

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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

No definition available.

+ Details

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- Definition

Value of input used to measure investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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