Note 18 - Stockholders' Equity - Accumulated Other Comprehensive Income (Details) - USD ($)		3 Months Ended				9 Months Ended
	Jan. 01, 2018	Sep. 30, 2018		Sep. 30, 2017		Sep. 30, 2018	Sep. 30, 2017
Beginning balance, loss, net of tax	$ 1,973,304,000					$ 1,973,304,000
Ending balance, loss, net of tax		$ 2,116,775,000				2,116,775,000
Reclassification adjustment for stranded tax effects of Tax Cuts and Job Act, tax	515,000
Ending balance, loss, net of tax	1,973,304,000	2,116,775,000				2,116,775,000
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Beginning balance, loss, net of tax	(1,060,000)	(24,084,000)		$ 1,001,000		(1,060,000)	$ (1,545,000)
Net unrealized (losses)/gains arising during the period, pre-tax		(3,603,000)	[1]	1,829,000	[1]	(23,854,000)	5,758,000
Net unrealized (losses)/gains arising during the period, tax		(1,065,000)		769,000		(7,051,000)	2,420,000
Net unrealized (losses)/gains arising during the period, net of tax		(2,538,000)		1,060,000		(16,803,000)	3,338,000
Reclassification adjustment for net losses/(gains) included in net income, pre-tax		14,000		(24,000)		14,000	439,000
Reclassification adjustment for net losses/(gains) included in net income, tax		4,000		(10,000)		4,000	185,000
Reclassification adjustment for net losses/(gains) included in net income, net of tax		10,000		(14,000)		10,000	254,000
Total other comprehensive (loss)/income, pre-tax		(3,589,000)		1,805,000		(23,840,000)	6,197,000
Total other comprehensive (loss)/income, tax		(1,061,000)		759,000		(7,047,000)	2,605,000
Total other comprehensive (loss)/income, net of tax		(2,528,000)		1,046,000		(16,793,000)	3,592,000
Ending balance, loss, net of tax		(26,612,000)		2,047,000		(26,612,000)	2,047,000
Reclassification adjustment for stranded tax effects of Tax Cuts and Job Act, tax						200,000
Reclassification adjustment for stranded tax effects of Tax Cuts and Job Act, net of tax						(200,000)
Ending balance, loss, net of tax	(1,060,000)	(24,084,000)		1,001,000		(26,612,000)	2,047,000
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Beginning balance, loss, net of tax	(1,451,000)	1,163,000		(2,421,000)		(1,451,000)	(2,170,000)
Net unrealized (losses)/gains arising during the period, pre-tax		2,365,000	[1]	271,000	[1]	6,523,000	(162,000)
Net unrealized (losses)/gains arising during the period, tax		699,000		114,000		1,928,000	(68,000)
Net unrealized (losses)/gains arising during the period, net of tax		1,666,000		157,000		4,595,000	(94,000)
Reclassification adjustment for net losses/(gains) included in net income, pre-tax
Reclassification adjustment for net losses/(gains) included in net income, tax
Reclassification adjustment for net losses/(gains) included in net income, net of tax
Total other comprehensive (loss)/income, pre-tax		2,365,000		271,000		6,523,000	(162,000)
Total other comprehensive (loss)/income, tax		699,000		114,000		1,928,000	(68,000)
Total other comprehensive (loss)/income, net of tax		1,666,000		157,000		4,595,000	(94,000)
Ending balance, loss, net of tax		2,829,000		(2,264,000)		2,829,000	(2,264,000)
Reclassification adjustment for stranded tax effects of Tax Cuts and Job Act, tax						315,000
Reclassification adjustment for stranded tax effects of Tax Cuts and Job Act, net of tax						(315,000)
Ending balance, loss, net of tax	(1,451,000)	1,163,000		(2,421,000)		2,829,000	(2,264,000)
AOCI Attributable to Parent [Member]
Beginning balance, loss, net of tax	(2,511,000)	(22,921,000)		(1,420,000)		(2,511,000)	(3,715,000)
Net unrealized (losses)/gains arising during the period, pre-tax		(1,238,000)	[1]	2,100,000	[1]	(17,331,000)	5,596,000
Net unrealized (losses)/gains arising during the period, tax		(366,000)		883,000		(5,123,000)	2,352,000
Net unrealized (losses)/gains arising during the period, net of tax		(872,000)		1,217,000		(12,208,000)	3,244,000
Reclassification adjustment for net losses/(gains) included in net income, pre-tax		14,000		(24,000)		14,000	439,000
Reclassification adjustment for net losses/(gains) included in net income, tax		4,000		(10,000)		4,000	185,000
Reclassification adjustment for net losses/(gains) included in net income, net of tax		10,000		(14,000)		10,000	254,000
Total other comprehensive (loss)/income, pre-tax		(1,224,000)		2,076,000		(17,317,000)	6,035,000
Total other comprehensive (loss)/income, tax		(362,000)		873,000		(5,119,000)	2,537,000
Total other comprehensive (loss)/income, net of tax		(862,000)		1,203,000		(12,198,000)	3,498,000
Ending balance, loss, net of tax		(23,783,000)		(217,000)		(23,783,000)	(217,000)
Reclassification adjustment for stranded tax effects of Tax Cuts and Job Act, tax						515,000
Reclassification adjustment for stranded tax effects of Tax Cuts and Job Act, net of tax						(515,000)
Reclassification adjustment for net losses/(gains) included in net income, pre-tax						(12,151,000)
Reclassification adjustment for net losses/(gains) included in net income, tax						(3,592,000)
Reclassification adjustment for net losses/(gains) included in net income, net of tax						(8,559,000)
Ending balance, loss, net of tax	$ (2,511,000)	$ (22,921,000)		$ (1,420,000)		$ (23,783,000)	$ (217,000)

[1] These amounts were recorded as of January 1, 2018 as a result of the adoption of ASU 2018-2.