SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Allowance for doubtful receivables
Movement in valuation and qualifying accounts
Balance Beginning of Period	$ 52,000	$ 52,000	$ 52,000
Additions Charged to Costs and Expenses	25,314	826	6,880
Deductions	27,314	826	6,880
Balance End of Period	50,000	52,000	52,000
Reserves for excess and obsolete inventory
Movement in valuation and qualifying accounts
Balance Beginning of Period	1,167,107	950,559	1,464,118
Additions Charged to Costs and Expenses	733,615	432,365	329,708
Deductions	753,892	215,817	843,267
Balance End of Period	1,146,830	1,167,107	950,559
Allowance for deferred tax asset valuation
Movement in valuation and qualifying accounts
Balance Beginning of Period	784,925	692,093
Additions Charged to Costs and Expenses	287,098	92,832	692,093
Balance End of Period	$ 1,072,023	$ 784,925	$ 692,093