Investment in Riverfront and Brooksville Joint Ventures (Details Narrative) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2015 USD ($) a ft²	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) a ft²	Jun. 30, 2014 USD ($)	Sep. 30, 2014 USD ($)	Aug. 08, 2014 USD ($)
Capital contributions made			$ 469	$ 297
Equity in the loss of the joint venture	$ (75)	$ (29)	(255)	(92)	$ (128)
Riverfront I Joint Venture
Value of land contributed			13,500
Cash contributed			$ 4,866
Joint venture percentage stake	76.91%		76.91%		76.91%
Equity in the loss of the joint venture			$ (226)		$ (89)
Brooksville Joint Venture
Land acreage | a	4,300		4,300
Joint venture percentage stake	50.00%		50.00%		50.00%
FRP land contribution previously leased to Vulcan | a	3,443		3,443
Book value of land contribution	$ 2,548		$ 2,548
Royalty revenues			237	$ 156
Allocated depletion expense			6
FRP additional contribution for land			$ 3,018
Additional land acquired | a	288		288
Vulcan land contribution | a	553		553
Mandatory capital contribution obligation	$ 2,380		$ 2,380
Capital contributions made			2,347
Equity in the loss of the joint venture			$ (29)		$ (39)
Riverfront I Joint Venture
Square feet | ft²	300,000		300,000
Retail square feet | ft²	18,000		18,000
Area of land to develop | a	2		2
Land acreage | a	5.82		5.82
Joint venture percentage stake	76.91%		76.91%
MRP minimum capital contribution	$ 5,553		$ 5,553
EB5 Secondary financing						$ 17,000
Nonrecourse construction loan						$ 65,000
Book value of land contribution	$ 6,165		$ 6,165