Note 5 - Goodwill and Other Intangible Assets (Details Textual) - USD ($)		3 Months Ended				6 Months Ended
	Jun. 20, 2019	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	May 10, 2018
Goodwill, Ending Balance		$ 1,107,000				$ 1,107,000		$ 1,728,000
Net Income (Loss) Attributable to Parent, Total		(1,655,000)	$ 323,000	$ 1,036,000	$ 1,065,000	(1,332,000)	$ 2,101,000
Goodwill, Impairment Loss	$ 0
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss, Writeoff						2,300,000
Prime Bank [Member]
Goodwill, Ending Balance		$ 1,100,000				1,100,000		$ 1,700,000	$ 2,100,000
Goodwill, Purchase Accounting Adjustments						$ (621,000)