Note 13 - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	34.00%
Deferred Tax Assets, Federal and State, Net Operating Losses Carryforward	$ 2,000	$ 2,100
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration	2,600	3,500
Deferred Tax Assets, Valuation Allowance, Total	$ 0	$ 0
Open Tax Year	2013 2014 2015 2016 2017 2018
Unrecognized Tax Benefits, Ending Balance	$ 0
Unrecognized Tax Benefits, Period Increase (Decrease), Total	0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total	0
Unrecognized Tax Benefits, Income Tax Penalties Accrued	$ 0