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Note 3 - Loans and Allowance for Loan Losses - Allowance for Loan Losses and Balance in the Loan Portfolio (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Beginning balance $ 4,790,000 $ 4,730,000 $ 4,057,000 $ 4,673,000  
Charge-offs (119,000) (61,000) (208,000) (167,000)  
Recoveries 79,000 132,000 126,000 295,000  
Provision 1,000,000 0 1,775,000 0  
Ending balance 5,750,000 4,801,000 5,750,000 4,801,000  
Individually evaluated for impairment 497,000 938,000 497,000 938,000 $ 355,000
Collectively evaluated for impairment 5,253,000 3,863,000 5,253,000 3,863,000 3,702,000
Individually evaluated for impairment 5,296,000 6,355,000 5,296,000 6,355,000 5,922,000
Collectively evaluated for impairment 897,529,000 390,872,000 897,529,000 390,872,000 788,397,000
Acquired with deteriorated credit quality 5,168,000 0 5,168,000 0 7,729,000
Loans 907,993,000 397,227,000 907,993,000 397,227,000 802,048,000
Agricultural [Member]          
Beginning balance 347,000 424,000 471,000 481,000  
Charge-offs 0 0 0 0  
Recoveries 0 65,000 0 65,000  
Provision (95,000) (127,000) (219,000) (184,000)  
Ending balance 252,000 362,000 252,000 362,000  
Individually evaluated for impairment 0 80,000 0 80,000 103,000
Collectively evaluated for impairment 252,000 282,000 252,000 282,000 368,000
Individually evaluated for impairment 379,000 389,000 379,000 389,000 924,000
Collectively evaluated for impairment 50,556,000 40,492,000 50,556,000 40,492,000 56,415,000
Acquired with deteriorated credit quality 0 0 0 0 0
Loans 50,935,000 40,881,000 50,935,000 40,881,000 57,339,000
Commercial and Industrial [Member]          
Beginning balance 853,000 857,000 655,000 892,000  
Charge-offs (17,000) (1,000) (17,000) (2,000)  
Recoveries 0 3,000 1,000 20,000  
Provision 562,000 (41,000) 759,000 (92,000)  
Ending balance 1,398,000 818,000 1,398,000 818,000  
Individually evaluated for impairment 31,000 84,000 31,000 84,000 0
Collectively evaluated for impairment 1,367,000 734,000 1,367,000 734,000 655,000
Individually evaluated for impairment 321,000 362,000 321,000 362,000 259,000
Collectively evaluated for impairment 237,852,000 84,720,000 237,852,000 84,720,000 141,583,000
Acquired with deteriorated credit quality 3,839,000 0 3,839,000 0 6,241,000
Loans 242,012,000 85,082,000 242,012,000 85,082,000 148,083,000
Consumer Portfolio Segment [Member]          
Beginning balance 220,000 336,000 270,000 254,000  
Charge-offs (95,000) (45,000) (184,000) (151,000)  
Recoveries 66,000 39,000 110,000 88,000  
Provision 52,000 5,000 47,000 144,000  
Ending balance 243,000 335,000 243,000 335,000  
Individually evaluated for impairment 6,000 10,000 6,000 10,000 4,000
Collectively evaluated for impairment 236,000 325,000 236,000 325,000 266,000
Individually evaluated for impairment 24,000 54,000 24,000 54,000 17,000
Collectively evaluated for impairment 33,745,000 24,628,000 33,745,000 24,628,000 38,524,000
Acquired with deteriorated credit quality 0 0 0 0 313,000
Loans 33,769,000 24,682,000 33,769,000 24,682,000 38,854,000
Commercial Real Estate Portfolio Segment [Member]          
Beginning balance 1,960,000 1,863,000 1,663,000 1,926,000  
Charge-offs 0 0 0 0  
Recoveries 0 4,000 0 6,000  
Provision 873,000 531,000 1,170,000 466,000  
Ending balance 2,833,000 2,398,000 2,833,000 2,398,000  
Individually evaluated for impairment 235,000 605,000 235,000 605,000 13,000
Collectively evaluated for impairment 2,599,000 1,793,000 2,599,000 1,793,000 1,650,000
Individually evaluated for impairment 2,246,000 2,937,000 2,246,000 2,937,000 2,288,000
Collectively evaluated for impairment 359,696,000 138,005,000 359,696,000 138,005,000 323,358,000
Acquired with deteriorated credit quality 1,121,000 0 1,121,000 0 733,000
Loans 363,063,000 140,942,000 363,063,000 140,942,000 326,379,000
Construction Real Estate [Member]          
Beginning balance 124,000 40,000 76,000 38,000  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Provision (45,000) 3,000 3,000 5,000  
Ending balance 79,000 43,000 79,000 43,000  
Individually evaluated for impairment 0 0 0 0 0
Collectively evaluated for impairment 79,000 43,000 79,000 43,000 76,000
Individually evaluated for impairment 0 0 0 0 0
Collectively evaluated for impairment 15,576,000 9,948,000 15,576,000 9,948,000 13,411,000
Acquired with deteriorated credit quality 0 0 0 0 0
Loans 15,576,000 9,948,000 15,576,000 9,948,000 13,411,000
Residential Portfolio Segment [Member]          
Beginning balance 1,061,000 558,000 640,000 537,000  
Charge-offs (7,000) (15,000) (7,000) (14,000)  
Recoveries 13,000 21,000 15,000 116,000  
Provision (122,000) (42,000) 297,000 (117,000)  
Ending balance 945,000 522,000 945,000 522,000  
Individually evaluated for impairment 225,000 159,000 225,000 159,000 235,000
Collectively evaluated for impairment 720,000 363,000 720,000 363,000 405,000
Individually evaluated for impairment 2,326,000 2,613,000 2,326,000 2,613,000 2,434,000
Collectively evaluated for impairment 200,104,000 93,079,000 200,104,000 93,079,000 215,106,000
Acquired with deteriorated credit quality 208,000 0 208,000 0 442,000
Loans 202,638,000 95,692,000 202,638,000 95,692,000 217,982,000
Unallocated Financing Receivables [Member]          
Beginning balance 225,000 652,000 282,000 545,000  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Provision (225,000) (329,000) (282,000) (222,000)  
Ending balance 0 323,000 0 323,000  
Individually evaluated for impairment 0 0 0 0 0
Collectively evaluated for impairment $ 0 $ 323,000 $ 0 $ 323,000 $ 282,000