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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 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Beginning balance $ 5,750,000 $ 4,801,000 $ 4,057,000 $ 4,673,000  
Charge-offs (343,000) (752,000) (551,000) (919,000)  
Recoveries 53,000 47,000 179,000 342,000  
Provision 1,225,000 0 3,000,000 0  
Ending balance 6,685,000 4,096,000 6,685,000 4,096,000  
Individually evaluated for impairment 233,000 291,000 233,000 291,000 $ 355,000
Collectively evaluated for impairment 6,452,000 3,805,000 6,452,000 3,805,000 3,702,000
Individually evaluated for impairment 5,089,000 5,665,000 5,089,000 5,665,000 5,922,000
Collectively evaluated for impairment 1,050,580,000 401,141,000 1,050,580,000 401,141,000 788,397,000
Acquired with deteriorated credit quality 23,127,000 0 23,127,000 0 7,729,000
Loans 1,078,796,000 406,806,000 1,078,796,000 406,806,000 802,048,000
Agricultural [Member]          
Beginning balance 252,000 362,000 471,000 481,000  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 65,000  
Provision 17,000 111,000 (202,000) (73,000)  
Ending balance 269,000 473,000 269,000 473,000  
Individually evaluated for impairment 0 85,000 0 85,000 103,000
Collectively evaluated for impairment 269,000 388,000 269,000 388,000 368,000
Individually evaluated for impairment 373,000 389,000 373,000 389,000 924,000
Collectively evaluated for impairment 53,130,000 49,668,000 53,130,000 49,668,000 56,415,000
Acquired with deteriorated credit quality 0 0 0 0 0
Loans 53,503,000 50,057,000 53,503,000 50,057,000 57,339,000
Commercial and Industrial [Member]          
Beginning balance 1,398,000 818,000 655,000 892,000  
Charge-offs (29,000) (81,000) (46,000) (83,000)  
Recoveries 1,000 1,000 2,000 21,000  
Provision (285,000) (87,000) 474,000 (179,000)  
Ending balance 1,085,000 651,000 1,085,000 651,000  
Individually evaluated for impairment 1,000 2,000 1,000 2,000 0
Collectively evaluated for impairment 1,084,000 649,000 1,084,000 649,000 655,000
Individually evaluated for impairment 345,000 279,000 345,000 279,000 259,000
Collectively evaluated for impairment 297,886,000 81,252,000 297,886,000 81,252,000 141,583,000
Acquired with deteriorated credit quality 7,889,000 0 7,889,000 0 6,241,000
Loans 306,120,000 81,531,000 306,120,000 81,531,000 148,083,000
Consumer Portfolio Segment [Member]          
Beginning balance 243,000 335,000 270,000 254,000  
Charge-offs (58,000) (71,000) (242,000) (222,000)  
Recoveries 46,000 25,000 156,000 113,000  
Provision 48,000 (27,000) 95,000 117,000  
Ending balance 279,000 262,000 279,000 262,000  
Individually evaluated for impairment 1,000 4,000 1,000 4,000 4,000
Collectively evaluated for impairment 278,000 258,000 278,000 258,000 266,000
Individually evaluated for impairment 19,000 20,000 19,000 20,000 17,000
Collectively evaluated for impairment 34,104,000 24,388,000 34,104,000 24,388,000 38,524,000
Acquired with deteriorated credit quality 30,000 0 30,000 0 313,000
Loans 34,153,000 24,408,000 34,153,000 24,408,000 38,854,000
Commercial Real Estate Portfolio Segment [Member]          
Beginning balance 2,833,000 2,398,000 1,663,000 1,926,000  
Charge-offs (255,000) (589,000) (255,000) (589,000)  
Recoveries 4,000 16,000 4,000 22,000  
Provision 961,000 (182,000) 2,131,000 284,000  
Ending balance 3,543,000 1,643,000 3,543,000 1,643,000  
Individually evaluated for impairment 13,000 14,000 13,000 14,000 13,000
Collectively evaluated for impairment 3,530,000 1,629,000 3,530,000 1,629,000 1,650,000
Individually evaluated for impairment 2,149,000 2,331,000 2,149,000 2,331,000 2,288,000
Collectively evaluated for impairment 449,041,000 141,975,000 449,041,000 141,975,000 323,358,000
Acquired with deteriorated credit quality 12,116,000 0 12,116,000 0 733,000
Loans 463,306,000 144,306,000 463,306,000 144,306,000 326,379,000
Construction Real Estate [Member]          
Beginning balance 79,000 43,000 76,000 38,000  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Provision 31,000 5,000 34,000 10,000  
Ending balance 110,000 48,000 110,000 48,000  
Individually evaluated for impairment 0 0 0 0 0
Collectively evaluated for impairment 110,000 48,000 110,000 48,000 76,000
Individually evaluated for impairment 0 0 0 0 0
Collectively evaluated for impairment 16,489,000 11,188,000 16,489,000 11,188,000 13,411,000
Acquired with deteriorated credit quality 0 0 0 0 0
Loans 16,489,000 11,188,000 16,489,000 11,188,000 13,411,000
Residential Portfolio Segment [Member]          
Beginning balance 945,000 522,000 640,000 537,000  
Charge-offs (1,000) (11,000) (8,000) (25,000)  
Recoveries 2,000 5,000 17,000 121,000  
Provision 122,000 (80,000) 419,000 (197,000)  
Ending balance 1,068,000 436,000 1,068,000 436,000  
Individually evaluated for impairment 218,000 186,000 218,000 186,000 235,000
Collectively evaluated for impairment 850,000 250,000 850,000 250,000 405,000
Individually evaluated for impairment 2,203,000 2,646,000 2,203,000 2,646,000 2,434,000
Collectively evaluated for impairment 199,930,000 92,670,000 199,930,000 92,670,000 215,106,000
Acquired with deteriorated credit quality 3,092,000 0 3,092,000 0 442,000
Loans 205,225,000 95,316,000 205,225,000 95,316,000 217,982,000
Unallocated Financing Receivables [Member]          
Beginning balance 0 323,000 282,000 545,000  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Provision 331,000 260,000 49,000 38,000  
Ending balance 331,000 583,000 331,000 583,000  
Individually evaluated for impairment 0 0 0 0 0
Collectively evaluated for impairment $ 331,000 $ 583,000 $ 331,000 $ 583,000 $ 282,000