Secured Credit Facility (Details) - Jun. 30, 2015 - USD ($)	Total
Secured Credit Facility (Details) [Line Items]
Debt Instrument, Maturity Date	Dec. 31, 2021
Debt Instrument, Threshold Amount, Dividends	$ 2,100,000
Interest Rate Swap [Member]
Secured Credit Facility (Details) [Line Items]
Aggregate Indebtedness	$ 14,000,000
Debt, Weighted Average Interest Rate	4.47%
Secured Debt [Member]
Secured Credit Facility (Details) [Line Items]
Long-term Line of Credit	$ 25,100,000
Secured Debt [Member] | Amended And Restated MLA With Co Bank [Member]
Secured Credit Facility (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	35,000,000
Revolving Credit Facility [Member]
Secured Credit Facility (Details) [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity	3,600,000
Revolving Credit Facility [Member] | Amended And Restated MLA With Co Bank [Member]
Secured Credit Facility (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	9,000,000
Additional Revolving Credit Facility [Member] | Amended And Restated MLA With Co Bank [Member]
Secured Credit Facility (Details) [Line Items]
Line of Credit Facility, Increase, Maximum Borrowing Capacity	6,000,000
Additional Secured Debt [Member] | Amended And Restated MLA With Co Bank [Member]
Secured Credit Facility (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	6,000,000
Secured Credit Facility [Member]
Secured Credit Facility (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 28,700,000
Debt Instrument, Covenant Description	Our new loan agreements include restrictions on our ability to pay cash dividends to our stockholders. However, we are allowed to pay dividends (a) (i) in an amount up to $2,100,000 in any year if our “Total Leverage Ratio,” that is, the ratio of our “Indebtedness” to “EBITDA” (earnings before interest, taxes, depreciation and amortization) – as defined in the loan documents, is greater than 2.50 to 1.00, and (ii) in any amount if our Total Leverage Ratio is less than 2.50 to 1.00, and (b) in either case, if we are not in default or potential default under the loan agreements.
Debt Instrument, Covenant Compliance	Our credit facility requires us to comply with specified financial ratios and tests. These financial ratios and tests include total leverage ratio, debt service coverage ratio, equity to total assets ratio, fixed coverage ratio and maximum annual capital expenditures tests.
Debt, Weighted Average Interest Rate	3.44%
MLA [Member] | Secured Debt [Member]
Secured Credit Facility (Details) [Line Items]
Debt Instrument, Frequency of Periodic Payment	quarterly