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Note 9 - Short-term Borrowings (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Schedule of Short-term Debt [Table Text Block] |
|  | 2017 |  |  | 2016 |
Overnight repurchase agreements with customers |  | $ | 7,003,122 |  |  | $ | 8,131,387 |
Federal funds purchased |  |  | 6,990,000 |  |  |  | 31,840,000 |
|  | $ | 13,993,122 |  |  | $ | 39,971,387 |
Schedule of Repurchase Agreements [Table Text Block] |
|  | 2017 |  |  | 2016 |
Average daily balance during the period |  | $ | 7,475,824 |  |  | $ | 30,082,866 |
Average daily interest rate during the period |  |  | 0.08 | % |  |  | 0.07 | %
Maximum month-end balance during the period |  | $ | 11,829,201 |  |  | $ | 59,833,229 |
Weighted average rate as of end of period |  |  | 0.15 | % |  |  | 0.02 | %
|  | 2017 |  |  | 2016 |
Average daily balance during the period |  | $ | 13,486,239 |  |  | $ | 19,105,595 |
Average daily interest rate during the period |  |  | 1.31 | % |  |  | 0.56 | %
Maximum month-end balance during the period |  | $ | 33,650,000 |  |  | $ | 51,750,000 |
Weighted average rate as of end of period |  |  | 1.24 | % |  |  | 0.70 | %
Securities Sold under Agreements to Repurchase [Member] |
Notes Tables |
Schedule of Underlying Assets of Repurchase Agreements when Amount of Repurchase Agreements Exceeds 10 Percent of Assets [Table Text Block] |
|  | 2017 |  |  | 2016 |
U.S. govt. sponsored agency securities |  | $ | 2,077,702 |  |  | $ | 630,077 |
Residential mortgage-backed and related securities |  |  | 18,816,280 |  |  |  | 19,090,261 |
Total securities pledged to overnight customer repurchase agreements |  |  | 20,893,982 |  |  |  | 19,720,338 |
Less: overcollateralized position |  |  | 13,890,860 |  |  |  | 11,588,951 |
|  | $ | 7,003,122 |  |  | $ | 8,131,387 |

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- Definition The entire disclosure for repurchase agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Tabular disclosure of short-term debt arrangements (having initial terms of repayment within one year or the normal operating cycle, if longer) including: (1) description of the short-term debt arrangement; (2) identification of the lender or type of lender; (3) repayment terms; (4) weighted average interest rate; (5) carrying amount of funds borrowed under the specified short-term debt arrangement as of the balance sheet date; (6) description of the refinancing of a short-term obligation when that obligation is excluded from current liabilities in the balance sheet; and (7) amount of a short-term obligation that has been excluded from current liabilities in the balance sheet because of a refinancing of the obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Tabular disclosure, as of the most recent balance sheet date, of securities or other assets sold under repurchase agreements when this amount exceeds 10 percent of total assets. Disclosure may include the following: the type of securities or assets sold under agreements to repurchase, the carrying amount, market value (including accrued interest plus any cash or other assets on deposit. The information is segregated into securities maturing (1) overnight; (2) term up to 30 days; (3) term of 30 to 90 days; (4) term over 90 days; (5) demand. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(i)(A)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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