Investment in Joint Ventures (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Sep. 30, 2015
Total Investment	$ 24,139		$ 24,139		$ 19,010
Total Assets of the Partnership	101,589		101,589		55,306
Net Loss of the Partnership			(425)		(188)
Company's share of Net Loss of the Partnership	$ (186)	$ (75)	$ (326)	$ (255)	$ (145)
Riverfront Holdings I, LLC
Ownership percent	76.91%		76.91%		76.91%
Total Investment	$ 11,705		$ 11,705		$ 11,517
Total Assets of the Partnership	$ 76,823		76,823		40,970
Net Loss of the Partnership			(365)		(108)
Company's share of Net Loss of the Partnership			$ (296)		$ (105)
Brooksville Quarry, LLC
Ownership percent	50.00%		50.00%		50.00%
Total Investment	$ 7,508		$ 7,508		$ 7,493
Total Assets of the Partnership	$ 14,351		14,351		14,336
Net Loss of the Partnership			(60)		(80)
Company's share of Net Loss of the Partnership			$ (30)		$ (40)
BC FRP Realty, LLC
Ownership percent	50.00%		50.00%
Total Investment	$ 4,926		$ 4,926
Total Assets of the Partnership	$ 10,415		10,415
Net Loss of the Partnership			0
Company's share of Net Loss of the Partnership			$ 0