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Note 3 - Loans - Impaired Loan Data (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Commercial and Agricultural Portfolio Segment [Member] | Commercial [Member]      
Unpaid contractual principal balance with no related allowance $ 646,000 $ 580,000 $ 454,000
Impaired balance with no related allowance 646,000 573,000 454,000
Average recorded investment with no related allowance 515,000 562,000 535,000
Interest income recognized with no related allowance 15,000 16,000 17,000
Interest income collected with no related allowance 18,000 19,000 21,000
Unpaid contractual principal balance with an allowance 91,000 123,000
Impaired balance with an allowance 0 91,000 123,000
Related allowance 0 91,000 95,000
Average recorded investment with an allowance 38,000 92,000 100,000
Interest income recognized with an allowance 0 0 2,000
Interest income collected with an allowance 0 0 3,000
Unpaid contractual principal balance 646,000 671,000 577,000
Impaired balance 646,000 664,000 577,000
Average recorded investment 553,000 654,000 635,000
Interest income recognized 15,000 16,000 19,000
Interest income collected 18,000 19,000 24,000
Commercial and Agricultural Portfolio Segment [Member] | Agricultural [Member]      
Unpaid contractual principal balance with no related allowance 301,000 174,000 196,000
Impaired balance with no related allowance 280,000 156,000 178,000
Average recorded investment with no related allowance 211,000 158,000 163,000
Interest income recognized with no related allowance 5,000 (10,000) (10,000)
Interest income collected with no related allowance 13,000 10,000 10,000
Unpaid contractual principal balance with an allowance 0 0
Impaired balance with an allowance 0 0 0
Related allowance 0 0 0
Average recorded investment with an allowance 0 0 0
Interest income recognized with an allowance 0 0 0
Interest income collected with an allowance 0 0 0
Unpaid contractual principal balance 301,000 174,000 196,000
Impaired balance 280,000 156,000 178,000
Average recorded investment 211,000 158,000 163,000
Interest income recognized 5,000 (10,000) (10,000)
Interest income collected 13,000 10,000 10,000
Real Estate Portfolio Segment [Member] | Commercial [Member]      
Unpaid contractual principal balance with no related allowance 16,457,000 14,412,000 15,569,000
Impaired balance with no related allowance 16,367,000 14,412,000 15,122,000
Average recorded investment with no related allowance 14,274,000 15,533,000 15,430,000
Interest income recognized with no related allowance 490,000 412,000 529,000
Interest income collected with no related allowance 480,000 418,000 531,000
Unpaid contractual principal balance with an allowance 8,316,000 6,941,000 8,969,000
Impaired balance with an allowance 8,316,000 6,282,000 8,956,000
Related allowance 2,470,000 243,000 1,608,000
Average recorded investment with an allowance 8,308,000 5,912,000 6,673,000
Interest income recognized with an allowance 177,000 132,000 214,000
Interest income collected with an allowance 173,000 123,000 209,000
Unpaid contractual principal balance 24,773,000 21,353,000 24,538,000
Impaired balance 24,683,000 20,694,000 24,078,000
Average recorded investment 22,582,000 21,445,000 22,103,000
Interest income recognized 667,000 544,000 743,000
Interest income collected 653,000 541,000 740,000
Real Estate Portfolio Segment [Member] | Commercial Construction [Member]      
Unpaid contractual principal balance with no related allowance 508,000 7,726,000 6,888,000
Impaired balance with no related allowance 508,000 2,736,000 1,898,000
Average recorded investment with no related allowance 825,000 3,191,000 2,867,000
Interest income recognized with no related allowance 16,000 17,000 26,000
Interest income collected with no related allowance 15,000 17,000 27,000
Unpaid contractual principal balance with an allowance 73,000 78,000 77,000
Impaired balance with an allowance 73,000 78,000 76,000
Related allowance 22,000 14,000 25,000
Average recorded investment with an allowance 74,000 97,000 92,000
Interest income recognized with an allowance 0 0 0
Interest income collected with an allowance 0 0 0
Unpaid contractual principal balance 581,000 7,804,000 6,965,000
Impaired balance 581,000 2,814,000 1,974,000
Average recorded investment 899,000 3,288,000 2,959,000
Interest income recognized 16,000 17,000 26,000
Interest income collected 15,000 17,000 27,000
Real Estate Portfolio Segment [Member] | Residential Construction [Member]      
Unpaid contractual principal balance with no related allowance 0 0  
Impaired balance with no related allowance 0 0  
Average recorded investment with no related allowance 0 0  
Interest income recognized with no related allowance 0 0  
Interest income collected with no related allowance 0 0  
Unpaid contractual principal balance with an allowance 0 0  
Impaired balance with an allowance 0 0  
Related allowance 0 0  
Average recorded investment with an allowance 0 0  
Interest income recognized with an allowance 0 0  
Interest income collected with an allowance 0 0  
Unpaid contractual principal balance 0 0  
Impaired balance 0 0  
Average recorded investment 0 0  
Interest income recognized 0 0  
Interest income collected 0 0  
Real Estate Portfolio Segment [Member] | Residential [Member]      
Unpaid contractual principal balance with no related allowance 5,321,000 5,359,000 5,429,000
Impaired balance with no related allowance 4,995,000 4,400,000 4,576,000
Average recorded investment with no related allowance 4,704,000 4,761,000 4,715,000
Interest income recognized with no related allowance 56,000 165,000 176,000
Interest income collected with no related allowance 178,000 148,000 159,000
Unpaid contractual principal balance with an allowance 858,000 1,082,000 1,083,000
Impaired balance with an allowance 851,000 1,082,000 1,075,000
Related allowance 435,000 308,000 308,000
Average recorded investment with an allowance 936,000 1,093,000 1,089,000
Interest income recognized with an allowance 4,000 12,000 16,000
Interest income collected with an allowance 6,000 12,000 16,000
Unpaid contractual principal balance 6,179,000 6,441,000 6,512,000
Impaired balance 5,846,000 5,482,000 5,651,000
Average recorded investment 5,640,000 5,854,000 5,804,000
Interest income recognized 60,000 177,000 192,000
Interest income collected 184,000 160,000 175,000
Real Estate Portfolio Segment [Member] | Farmland [Member]      
Unpaid contractual principal balance with no related allowance 921,000 1,398,000 1,105,000
Impaired balance with no related allowance 919,000 1,397,000 1,103,000
Average recorded investment with no related allowance 1,071,000 1,419,000 1,340,000
Interest income recognized with no related allowance (4,000) 1,000 1,000
Interest income collected with no related allowance 1,000 2,000 2,000
Unpaid contractual principal balance with an allowance 382,000 390,000 388,000
Impaired balance with an allowance 382,000 390,000 388,000
Related allowance 33,000 57,000 37,000
Average recorded investment with an allowance 385,000 392,000 391,000
Interest income recognized with an allowance 16,000 16,000 21,000
Interest income collected with an allowance 14,000 16,000 21,000
Unpaid contractual principal balance 1,303,000 1,788,000 1,493,000
Impaired balance 1,301,000 1,787,000 1,491,000
Average recorded investment 1,456,000 1,811,000 1,731,000
Interest income recognized 12,000 17,000 22,000
Interest income collected 15,000 18,000 23,000
Consumer and Other Portfolio Segment [Member] | Consumer [Member]      
Unpaid contractual principal balance with no related allowance 241,000 195,000 180,000
Impaired balance with no related allowance 241,000 187,000 178,000
Average recorded investment with no related allowance 214,000 195,000 191,000
Interest income recognized with no related allowance 7,000 8,000 14,000
Interest income collected with no related allowance 9,000 11,000 15,000
Unpaid contractual principal balance with an allowance 0 0 0
Impaired balance with an allowance 0 0 0
Related allowance 0 0 0
Average recorded investment with an allowance 0 0 0
Interest income recognized with an allowance 0 0 0
Interest income collected with an allowance 0 0 0
Unpaid contractual principal balance 241,000 195,000 180,000
Impaired balance 241,000 187,000 178,000
Average recorded investment 214,000 195,000 191,000
Interest income recognized 7,000 8,000 14,000
Interest income collected 9,000 11,000 15,000
Consumer and Other Portfolio Segment [Member] | Other [Member]      
Unpaid contractual principal balance with no related allowance 0 0 0
Impaired balance with no related allowance 0 0 0
Average recorded investment with no related allowance 0 65,000 48,000
Interest income recognized with no related allowance 0 0 0
Interest income collected with no related allowance 0 0 0
Unpaid contractual principal balance with an allowance 0 0 0
Impaired balance with an allowance 0 0 0
Related allowance 0 0 0
Average recorded investment with an allowance 0 0 0
Interest income recognized with an allowance 0 0 0
Interest income collected with an allowance 0 0 0
Unpaid contractual principal balance 0 0 0
Impaired balance 0 0 0
Average recorded investment 0 65,000 48,000
Interest income recognized 0 0 0
Interest income collected 0 0 0
Unpaid contractual principal balance with no related allowance 24,395,000 29,844,000 29,821,000
Impaired balance with no related allowance 23,956,000 23,861,000 23,509,000
Average recorded investment with no related allowance 21,814 25,884,000 25,289,000
Interest income recognized with no related allowance 585,000 609,000 753,000
Interest income collected with no related allowance 714,000 625,000 765,000
Unpaid contractual principal balance with an allowance 9,629,000 8,582,000 10,640,000
Impaired balance with an allowance 9,622,000 7,923,000 10,618,000
Related allowance 2,960,000 713,000 2,073,000
Average recorded investment with an allowance 9,741,000 7,586,000 8,345,000
Interest income recognized with an allowance 197,000 160,000 253,000
Interest income collected with an allowance 193,000 151,000 249,000
Unpaid contractual principal balance 34,024,000 38,426,000 40,461,000
Impaired balance 33,578,000 31,784,000 34,127,000
Average recorded investment 31,555,000 33,470,000 33,634,000
Interest income recognized 782,000 769,000 1,006,000
Interest income collected $ 907,000 $ 776,000 $ 1,014,000