Note 6 - Goodwill and Intangibles (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

Schedule of Goodwill [Table Text Block]

	2018		2017		2016
Balance at the beginning of period	$	28,334,092	$	13,110,913	$	3,222,688
Goodwill from merger with Springfield Bancshares		45,974,931		—		—
Goodwill from acquisition of the Bates Companies		3,766,074		—		—
Goodwill from acquisition of Guaranty Bank		—		15,223,179		—
Goodwill from acquisition of Guaranty Bank - measurement period adjustment		(243,195)		—		—
Goodwill from acquisition of CSB		—		—		9,888,225
Balance at the end of period	$	77,831,902	$	28,334,092	$	13,110,913

Core Deposits [Member]

Notes Tables

Schedule of Finite-Lived Intangible Assets [Table Text Block]

	2018		2017		2016
Balance at the beginning of the period	$	9,078,953	$	7,381,213	$	1,471,409
Core deposit intangible from merger with Springfield Bancshares		8,208,728		—		—
Core deposit intangible from acquisition of Guaranty Bank		—		2,698,301		—
Core deposit intangible from acquisition of CSB		—		—		6,352,653
Amortization expense		(1,692,431)		(1,000,561)		(442,849)
Balance at the end of the period	$	15,595,250	$	9,078,953	$	7,381,213
Gross carrying amount	$	19,254,809	$	11,046,081	$	8,347,780
Accumulated amortization		(3,659,559)		(1,967,128)		(966,567)
Net book value	$	15,595,250	$	9,078,953	$	7,381,213

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

Years ending December 31,	Amount
2019	$	2,129,141
2020		2,084,985
2021		2,032,204
2022		1,970,792
2023		1,776,065
Thereafter		5,602,063
	$	15,595,250

Customer Lists [Member]

Notes Tables

Schedule of Finite-Lived Intangible Assets [Table Text Block]

	2018
Balance at the beginning of period	$	—
Customer list intangible from acquisition of Bates Companies		1,854,932
Balance at the end of period		1,854,932

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

Years ending December 31,	Amount
2019	$	123,662
2020		123,662
2021		123,662
2022		123,662
2023		123,662
Thereafter		1,236,622
	$	1,854,932