Note 17 - Regulatory Capital Requirements and Restrictions on Dividends - (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2020 security	Feb. 18, 2020 shares
The number of junior subordinated private placement debentures issued		4
The number of junior subordinated private placement debentures assumed		3
Outstanding shares (as a percent)	5.00%
Maximum
Shares repurchased | shares			800,000