Note 1 - Significant Accounting Policies - Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Jun. 30, 2015
Balance at Beginning of Period	$ 15	$ 99	$ 73	$ 92
Charged to Costs and Expenses	84	(38)	71
Deductions			(45)	(77)
Balance at End of Period	$ 99	$ 61	$ 99	$ 15