Note 1 - Nature of Business and Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Impairment of Long-Lived Assets Held-for-use	$ 0	$ 0
Allowance for Doubtful Accounts Receivable, Current	$ 0	$ 0
Period Subject To Examination Federal And State Income Tax Returns	3 years