Note 18 - Segments (Details Textual) - USD ($)	Mar. 31, 2020	Dec. 31, 2019	May 01, 2019	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 1996
Goodwill, Ending Balance	$ 12,513,000	$ 12,513,000		$ 682,000	$ 682,000
King Bancorp Inc. [Member]
Goodwill, Ending Balance	12,000,000		$ 11,831,000
Commercial Banking [Member] | Indiana Bank [Member]
Goodwill, Ending Balance						$ 682,000
Commercial Banking [Member] | Operating Segments [Member]
Goodwill, Ending Balance	$ 12,500,000
Commercial Banking [Member] | Operating Segments [Member] | Indiana Bank [Member]
Goodwill, Ending Balance						$ 682,000
Commercial Banking [Member] | Operating Segments [Member] | King Bancorp Inc. [Member]
Goodwill, Ending Balance			$ 11,800,000