Note 6 - Common Stock and Warrants of ROIC (Details)				3 Months Ended	6 Months Ended
	Oct. 23, 2014 shares	Sep. 19, 2014 $ / shares shares	Jun. 23, 2011 $ / shares shares	Jun. 30, 2014 USD ($) shares	Jun. 30, 2015 USD ($) $ / shares shares	Jun. 30, 2014 USD ($) shares	Dec. 31, 2014 $ / shares	Jul. 31, 2013 USD ($)
Note 6 - Common Stock and Warrants of ROIC (Details) [Line Items]
Common Stock, Par or Stated Value Per Share (in Dollars per share) | $ / shares					$ 0.0001		$ 0.0001
Proceeds from Issuance of Common Stock (in Dollars)					$ 9,936,000	$ 214,906,000
Payments of Stock Issuance Costs (in Dollars)					$ 325,000	9,164,000
Number of Days Notice			30 days
Proceeds from Warrant Exercises (in Dollars)						$ 40,911,000
Stock Repurchase Program, Authorized Amount (in Dollars)								$ 50,000,000
Stock Repurchased During Period, Shares | shares					0
2014 Sales Agreements ATM Program [Member]
Note 6 - Common Stock and Warrants of ROIC (Details) [Line Items]
Number of Sales Agreements Entered Into		4
Common Stock, Par or Stated Value Per Share (in Dollars per share) | $ / shares		$ 0.0001
Common Shares That May be Sold Under a Sales Agreement Aggregate Offering Price, Maximum | shares		100,000,000
Stock Issued During Period, Shares, New Issues | shares					544,567
Proceeds from Issuance of Common Stock (in Dollars)					$ 9,900,000
Payments of Stock Issuance Costs (in Dollars)					$ 149,000
Minimum Price Company's Common Stock Must Trade Before Warrants Issued in The IPO Can Be Redeemed [Member]
Note 6 - Common Stock and Warrants of ROIC (Details) [Line Items]
Share Price (in Dollars per share) | $ / shares			$ 18.75
Private Placement Warrants [Member]
Note 6 - Common Stock and Warrants of ROIC (Details) [Line Items]
Warrants Purchased By Sponsor During IPO | shares			8,000,000
Warrants, Sales Price Per Warrant (in Dollars per share) | $ / shares			$ 1.00
Public Warrants [Member]
Note 6 - Common Stock and Warrants of ROIC (Details) [Line Items]
Warrants, Repurchase Price Per Warrant (in Dollars per share) | $ / shares			0.01
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per share) | $ / shares			$ 12.00
Class Of Warrant Or Right Number Of Warrants Exercised | shares				2,754,489		3,393,873
Proceeds from Warrant Exercises (in Dollars)				$ 33,100,000		$ 40,700,000
Class of Warrant or Right, Cancelled During Period | shares	64,452
Public and Private Placement Warrants [Member]
Note 6 - Common Stock and Warrants of ROIC (Details) [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance | shares			53,400,000