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Note 9 - Acquisition of Community State Bank and Common Stock Offering (Details Textual) |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
May 23, 2016 USD ($) $ / shares shares | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) | Dec. 31, 2015 USD ($)
CSB [Member] |  |  |  |  |  |  |
Number of Branches |  |  | 10 |  | 10 |  |
Assets |  |  | $ 571,000,000 |  | $ 571,000,000 |  |
Loans and Leases Receivable, Gross |  |  | 433,000,000 |  | 433,000,000 |  |
Deposits |  |  | 481,000,000 |  | 481,000,000 |  |
CSB [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  | 100.00% |  |  |  |  |
Business Combination, Consideration Transferred |  | $ 80,000,000 |  |  |  |  |
Dividends, Cash |  | 15,000,000 |  |  |  |  |
CSB [Member] |  |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares | 1,215,000 |  |  |  |  |  |
Business Acquisition, Share Price | $ / shares | $ 24.75 |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  | 355,000 |  |  |  |
Scenario, Forecast [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |
Proceeds from Lines of Credit |  | $ 5,000,000 |  |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | 10,000,000 |  | 10,000,000 |  | $ 40,000,000
Assets |  |  | 2,683,434,288 | $ 2,542,968,846 | 2,683,434,288 | $ 2,542,968,846 | 2,593,198,275
Loans and Leases Receivable, Gross |  |  | 1,922,773,397 |  | 1,922,773,397 |  | 1,798,022,675
Deposits |  |  | 1,973,593,784 |  | 1,973,593,784 |  | $ 1,880,666,184
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned | $ 30,000,000 |  |  |  |  |  |
Notes Payable |  |  | 30,000,000 |  | 30,000,000 |  |
Business Combination, Acquisition Related Costs |  |  | $ 354,969 |  | $ 354,969 |  |

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(12)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Value of equity interests (such as common shares, preferred shares, or partnership interest) issued or issuable to acquire the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Number of shares of equity interests issued or issuable to acquire entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=73531572&loc=d3e1043-128460 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65884687&loc=d3e4428-111522 + Details
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