Business Segments - Business segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014	Sep. 30, 2014
Revenues	$ 8,948us-gaap_Revenues	$ 8,007us-gaap_Revenues	$ 17,250us-gaap_Revenues	$ 15,236us-gaap_Revenues
Interest expense	620us-gaap_InterestExpense	310us-gaap_InterestExpense	1,065us-gaap_InterestExpense	599us-gaap_InterestExpense
Capital expenditures - Real estate taxes	1,234us-gaap_RealEstateTaxExpense	879us-gaap_RealEstateTaxExpense	2,329us-gaap_RealEstateTaxExpense	1,719us-gaap_RealEstateTaxExpense
Depreciation, depletion and amortization			3,851	3,384
Cash items	717		717		1,074
Total identifiable net assets	252,085us-gaap_Assets		252,085us-gaap_Assets		313,071us-gaap_Assets
Asset Management
Revenues	7,330	6,580	14,087	12,340
Operating profit	3,187	2,840	6,573	5,548
Corporate expenses	(236)	(178)	(426)	(356)
Interest expense	620	310	1,065	599
Depreciation, depletion and amortization	1,776	1,619	3,562	3,151
Identifiable net assets	152,222		152,222		144,420
Mining royalty land
Revenues	1,335	1,226	2,679	2,494
Operating profit	1,191	1,068	2,391	2,196
Corporate expenses	(250)	(189)	(451)	(378)
Capital expenditures	0	0	0	0
Depreciation, depletion and amortization	30	28	61	56
Identifiable net assets	40,459		40,459		39,368
Land Development and Construction
Revenues	283	201	484	402
Operating profit	(739)	(363)	(1,267)	(705)
Corporate expenses	(140)	(105)	(251)	(210)
Depreciation, depletion and amortization	72	46	138	92
Identifiable net assets	57,459		57,459		67,136
Combined Land Development and Construction and Asset Management
Capital expenditures	319	436	1,610	3,570
Capital expenditures - Capitalized interest	248	477	569	993
Capital expenditures - Internal labor	85	100	184	195
Capital expenditures - Real estate taxes	39	16	66	40
Corporate
Corporate expenses	(692)	(418)	(984)	(553)
Identifiable net assets	1,228		1,228		1,608
Total Segments
Revenues	8,948	8,007	17,250	15,236
Operating profit	2,159	2,469	4,504	4,645
Unallocated to discontinued operations	(162)	(186)	(1,081)	(897)
Interest expense	620	310	1,065	599
Capital expenditures	691	1,029	2,429	4,798
Depreciation, depletion and amortization	$ 1,878	$ 1,693	$ 3,761	$ 3,299

Assets grouped by segment.

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