Note 3 - Summary of Significant Accounting Policies - Roll-forward of Allowance for Doubtful Accounts (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Provision	$ 2,497
Allowance for Doubtful Accounts Student Accounts Receivable [Member]
Balance at beginning of period	3,494
Provision	1,090
Write-offs	(1,187)
Balance at end of period	$ 3,397