Note 13 - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%
Deferred Tax Assets, Valuation Allowance, Total	$ 166,545	$ 163,992
Operating Loss Carryforwards, Total	727,200
Operating Loss Carryforwards, Mortgage Securities	250,300
Operating Loss Carryforwards with No Expiration	92,600
Unrecognized Tax Benefits, Ending Balance	0	11	$ 328
Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations, Due In Next Twelve Months	10
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total	$ 100	$ 100
Open Tax Year	2016 2017 2018 2019
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Earliest Tax Year [Member]
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2025
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Latest Tax Year [Member]
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2037
State and Local Jurisdiction [Member] | Earliest Tax Year [Member]
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2018
State and Local Jurisdiction [Member] | Latest Tax Year [Member]
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2037