Commitments and Contingencies: (Detail) (USD $)	12 Months Ended
Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012
Employee Benefit Plan
Service period for vesting of employer contribution	5 years
Company contributions	$ 297,400	$ 281,900	$ 271,800
Operating Leases
Rent expense under operating leases	1,026,800us-gaap_OperatingLeasesRentExpenseNet	883,800us-gaap_OperatingLeasesRentExpenseNet	866,300us-gaap_OperatingLeasesRentExpenseNet
Minimum rental commitments
2015	677,500
2016	691,200
2017	705,000
2018	718,800
2019	451,100
Total	3,243,600
Total deferred rent	1,000,000us-gaap_DeferredRentCredit	1,100,000us-gaap_DeferredRentCredit
Deferred rent included in other liabilities	$ 800,000us-gaap_DeferredRentCreditNoncurrent	$ 1,000,000us-gaap_DeferredRentCreditNoncurrent

The cumulative difference between the rental payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense over the term of the leased property by the lessor or lessee, respectively.

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-Publisher FASB

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For a classified balance sheet, the cumulative difference between the rental income or payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense, by the lessor or lessee, respectively, more than one year after the balance sheet date.

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The amount of the cost recognized during the period for defined contribution plans.

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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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The minimum period for which an individual is required to perform services in order to be fully vested for employer contribution under the defined contribution plan.

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