Note 3 - Stockholders' Equity (Details) $ / shares in Units, $ in Thousands	1 Months Ended	6 Months Ended
	Mar. 31, 2015 USD ($) $ / shares shares	Jun. 30, 2015 USD ($) shares	Dec. 31, 2014 shares
Note 3 - Stockholders' Equity (Details) [Line Items]
Proceeds from Issuance of Common Stock (in Dollars) | $		$ 167,378
Capital Units, Authorized		135,000,000
Common Stock, Shares Authorized		100,000,000	100,000,000
Common Stock, Voting Rights, Votes Per Share		1
Stock Repurchase Program, Number of Shares Authorized to be Repurchased		5,000,000
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased		279,200
Common Stock, Capital Shares Reserved for Future Issuance		6,964,824	7,116,171
Underwritten Offering [Member]
Note 3 - Stockholders' Equity (Details) [Line Items]
Stock Issued During Period, Shares, New Issues	13,500,000
Share Price (in Dollars per share) | $ / shares	$ 13.00
Proceeds from Issuance of Common Stock (in Dollars) | $	$ 167,400
Issuance of Stock, Underwriting Discount (in Dollars) | $	7,500
Issuance of Stock, Underwriting Expenses (in Dollars) | $	$ 800
Common Class A [Member]
Note 3 - Stockholders' Equity (Details) [Line Items]
Common Stock, Shares Authorized		15,000,000	15,000,000
Common Stock, Voting Rights, Votes Per Share		10
Common Stock, Capital Shares Reserved for Future Issuance		476,193	763,706
Blank Check Preferred Stock [Member]
Note 3 - Stockholders' Equity (Details) [Line Items]
Preferred Stock, Shares Authorized		20,000,000