Note 16 - Earnings Per Share - Calculation of Basic and Diluted Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Net income									$ 11,075	$ 13,349
Basic (in shares)									19,802,095	16,799,004
Plus: common share equivalents (in shares)									5,497	21,749
Diluted weighted-average number of common stock outstanding (in shares)									19,807,592	16,820,753
Basic (in dollars per share)	$ 0.17	$ 0.12	$ 0.13	$ 0.14	$ 0.42	$ 0.11	$ 0.14	$ 0.12	$ 0.56	$ 0.79
Diluted (in dollars per share)	$ 0.17	$ 0.12	$ 0.13	$ 0.14	$ 0.42	$ 0.11	$ 0.14	$ 0.12	$ 0.56	$ 0.79