Accrued Liabilities: (Details) - USD ($)	Dec. 31, 2016	Dec. 26, 2015
Accrued Liabilities
Accrued salaries, wages, commissions and bonuses	$ 722,500	$ 414,300
Accrued vacation	186,900	221,000
Accrued interest	253,500	283,800
Other	648,200	956,600
Accrued liabilities	$ 1,811,100	$ 1,875,700