Note 11 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2018
Operating Loss Carryforwards, Total			$ 53,600
Deferred Tax Assets, Operating Loss Carryforwards, Total	$ 18,375	$ 18,375	17,163
Deferred Tax Assets, Tax Credit Carryforwards, Other			7,700
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax			1,100
Income Taxes Receivable	7,200	7,200	9,000
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability	23,400
Low income Housing Tax Credit Investments, Pretax Write-down	$ 2,600	$ 2,600
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member]
Operating Loss Carryforwards, Total			63,100
Deferred Tax Assets, Operating Loss Carryforwards, Total			$ 6,900