Note 5 - Changes in Carrying Amount of Goodwill (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Balance as of the beginning of the period	$ 28,916,000	$ 0
Goodwill acquired during the period		28,916,000
Balance as of the end of the period	$ 28,916,000	$ 28,916,000