Note 12 - Income Taxes - Income Tax Provisions (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Federal:
Federal tax provision, current	$ 2,899	$ 6,703	$ 9,064	$ 16,308
Federal tax provision, deferred	(592)	(2,023)	(839)	(1,303)
Total federal tax provision	2,307	4,680	8,225	15,005
State and Local:
State and local tax provision, current	33	1,398	1,722	2,817
State and local tax provision, deferred	(430)	(787)	(598)	(502)
Total state and local tax provision (benefit)	(397)	611	1,124	2,315
Total income tax provision	$ 1,910	$ 5,291	$ 9,349	$ 17,320