Investments (Change in Accounting Principle) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]
INVESTMENTS	$ 29,809,264		$ 29,809,264			$ 25,292,634
Investments in affiliates	3,906,647		3,906,647			3,428,633
Retained earnings	100,247,941	96,413,662	100,247,941	96,413,662	95,699,369	98,518,546	95,816,572	97,758,013
Total stockholders' equity	118,560,702		118,560,702			114,432,381
Dividend income	95,846	737,264	199,846	1,486,000
Equity in affiliate earnings (losses), net of tax	57,064	(10,031)	5,838	(12,253)
Net income (loss)	5,488,675	1,863,098	2,669,498	(78,343)
Net income per share (in dollars per share)	$ 1.39	$ 0.46	$ 0.68	$ (0.02)
General Finance Incorporated (GFI) [Member]
Schedule of Equity Method Investments [Line Items]
Investments in affiliates	3,906,647		3,906,647			3,428,633
Equity in affiliate earnings (losses), net of tax		(10,031)		(12,253)
Net income (loss)		1,863,098		(78,343)
Net income per share (in dollars per share)		$ 0.46		$ (0.02)
As Previously Reported [Member] | General Finance Incorporated (GFI) [Member]
Schedule of Equity Method Investments [Line Items]
Equity in affiliate earnings (losses), net of tax		0		0
Net income (loss)		$ 1,878,751		$ (60,468)
Net income per share (in dollars per share)		$ 0.47		$ (0.02)