Concentration of Credit Risk (Details) (USD $)	12 Months Ended
	Dec. 31, 2013 Customer	Dec. 31, 2012 Customer
Concentration Risk [Line Items]
Number of significant customers	4	4
Payments received from customers	$ 984,000	$ 180,000
Accounts receivable, allowance for doubtful accounts	0	2,419,400
Operating leases, minimum future lease revenue payments receivable under noncancelable leases [Abstract]
2014	17,648,900
2015	10,932,800
2016	9,508,400
2017	5,927,000
2018	2,552,800
Thereafter	12,570,800
Total	59,140,700
Finance leases, minimum future lease revenue payments receivable under noncancelable leases [Abstract]
2014	238,900
2015	182,400
2016	182,400
2017	171,900
2018	32,500
Thereafter	0
Total	808,100
Interest income included finance lease	300,100
Customer One [Member]
Concentration Risk [Line Items]
Receivables		3,300,000
Accounts receivable, allowance for doubtful accounts		2,419,400
Customer One [Member] | Lease Revenue [Member]
Concentration Risk [Line Items]
Lease revenues and receivables from significant customers (in hundredths)	23.00%	15.00%
Customer One [Member] | Receivable [Member]
Concentration Risk [Line Items]
Lease revenues and receivables from significant customers (in hundredths)		71.00%
Customer Two [Member] | Lease Revenue [Member]
Concentration Risk [Line Items]
Lease revenues and receivables from significant customers (in hundredths)	19.00%	13.00%
Customer Three [Member] | Lease Revenue [Member]
Concentration Risk [Line Items]
Lease revenues and receivables from significant customers (in hundredths)	11.00%	11.00%
Customer Four [Member] | Lease Revenue [Member]
Concentration Risk [Line Items]
Lease revenues and receivables from significant customers (in hundredths)	10.00%	10.00%
Two Customers [Member]
Concentration Risk [Line Items]
Receivables	$ 1,231,500
Two Customers [Member] | Receivable [Member]
Concentration Risk [Line Items]
Lease revenues and receivables from significant customers (in hundredths)	40.00%