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Note 21 - Fair Value (Details) - Assets Measured at Fair Value on a Recurring Basis - USD ($) | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Securities available for sale: |  |
U.S. govt. sponsored agency securities | $ 323,434,982 | $ 451,659,630
Derivative instruments | 856,024 | 1,487,387
| 324,291,006 | 453,147,017
Impaired loans/leases | 12,268,677 | 26,256,409
Impaired Loans/Leases [Member] |  |
Securities available for sale: |  |
Impaired loans/leases | 4,545,966 | 12,467,362
Other Real Estate Owned [Member] |  |
Securities available for sale: |  |
Impaired loans/leases | 7,722,711 | 13,789,047
US Government Agencies Debt Securities [Member] |  |
Securities available for sale: |  |
U.S. govt. sponsored agency securities | 213,537,379 | 307,869,572
Residential Mortgage Backed Securities [Member] |  |
Securities available for sale: |  |
U.S. govt. sponsored agency securities | 80,670,135 | 111,423,224
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available for sale: |  |
U.S. govt. sponsored agency securities | 27,578,588 | 30,399,981
Other Securities [Member] |  |
Securities available for sale: |  |
U.S. govt. sponsored agency securities | 1,648,880 | 1,966,853
Fair Value, Inputs, Level 1 [Member] |  |
Securities available for sale: |  |
| 411 | 345,952
Fair Value, Inputs, Level 1 [Member] | Other Securities [Member] |  |
Securities available for sale: |  |
U.S. govt. sponsored agency securities | 411 | 345,952
Fair Value, Inputs, Level 2 [Member] |  |
Securities available for sale: |  |
Derivative instruments | 856,024 | 1,487,387
| 324,290,595 | 452,801,065
Fair Value, Inputs, Level 2 [Member] | US Government Agencies Debt Securities [Member] |  |
Securities available for sale: |  |
U.S. govt. sponsored agency securities | 213,537,379 | 307,869,572
Fair Value, Inputs, Level 2 [Member] | Residential Mortgage Backed Securities [Member] |  |
Securities available for sale: |  |
U.S. govt. sponsored agency securities | 80,670,135 | 111,423,224
Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Securities available for sale: |  |
U.S. govt. sponsored agency securities | 27,578,588 | 30,399,981
Fair Value, Inputs, Level 2 [Member] | Other Securities [Member] |  |
Securities available for sale: |  |
U.S. govt. sponsored agency securities | 1,648,469 | 1,620,901
Fair Value, Inputs, Level 3 [Member] |  |
Securities available for sale: |  |
Impaired loans/leases | 12,268,677 | 26,256,409
Fair Value, Inputs, Level 3 [Member] | Impaired Loans/Leases [Member] |  |
Securities available for sale: |  |
Impaired loans/leases | 4,545,966 | 12,467,362
Fair Value, Inputs, Level 3 [Member] | Other Real Estate Owned [Member] |  |
Securities available for sale: |  |
Impaired loans/leases | $ 7,722,711 | $ 13,789,047

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