Note 10 - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%	35.00%	35.00%
Net Deferred Tax Asset Before Valuation Allowance	$ 21,393	$ 20,208
Deferred Tax Assets, Operating Loss Carryforwards	8,896	10,775
Deferred Tax Assets, Temporary Timing Differences	12,500
Deferred Tax Assets, Unrealized Losses on Available-for-Sale Securities, Gross	$ 4,087	1,774
Period of Net Operating Loss Carried Back	2 years
Period of Net Operating Loss Carried Forward	20 years
Operating Loss Carryforwards	$ 24,000
Deferred Tax Asset, Projected Realization Amount	9,200	6,500
Deferred Tax Assets, Valuation Allowance	12,214	13,722
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	0	$ 0	$ 0
Liability for Uncertainty in Income Taxes, Current	$ 0