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Note 3 - Available-for-sale Securities (Details Textual) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	10		10
Number of Available-for-sale Securities	19		16
Unrealized Holding Losses Depreciation Percentage from Amortized Cost	5.40%		4.40%
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Total	$ 0
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Total	0
Payments to Acquire Debt Securities, Available-for-sale		$ 0
Proceeds from Sale of Debt Securities, Available-for-sale	0	0
Subordinated Notes [Member]
Payments to Acquire Debt Securities, Available-for-sale	2,400
Corporate Debt Securities [Member]
Payments to Acquire Debt Securities, Available-for-sale	3,000
Securities Acquired in Business Acquisition [Member]
Proceeds from Sale of Debt Securities, Available-for-sale		35,500
Debt Securities, Available-for-sale, Realized Gain (Loss), Total		$ 0
Available-For-Sale Securities Pledged to Secure Municipal Deposits [Member]
Debt Securities, Available-for-sale, Restricted	6,700		$ 7,000
Available-For-Sale Securities Pledged to FRB of New York [Member]
Debt Securities, Available-for-sale, Restricted	5,200		5,500
Available-For-Sale Securities Pledged to St. Louis Fed [Member]
Debt Securities, Available-for-sale, Restricted	$ 1,500		$ 1,500

X

- Definition

The number of available-for-sale securities held.

+ References

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- Definition

Amount of realized gain (loss) on 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/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
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Amount of restricted 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 860
-SubTopic 30
-Section 50
-Paragraph 1A
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-URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729

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Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
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Amount of other-than-temporary impairment (OTTI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), recognized in earnings and other comprehensive loss (OCI).

+ References

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-Section 45
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The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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Amount of cash outflow to acquire investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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-Publisher FASB
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-Topic 230
-SubTopic 10
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Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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