Note 15 - Income Taxes - Summary of Income Tax Expense (Benefit) Charged to Statement of Comprehensive Income (Loss) and Statement of Stockholders' Equity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income tax expense	$ 2,041	$ 2,584
Other comprehensive income (loss), tax effect	$ (110)	$ 655