Schedule II - Valuation and Qualifying Accounts (Details) - Valuation and Qualifying Accounts (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Allowance for Doubtful Accounts [Member]
Year ended 2013
Balance at the Beginning of Year	$ 162,000	$ 149,000	$ 134,000
Additions Charged to Costs and Expense	115,000	48,000	23,000
Deductions	(78,000)	(35,000)	(8,000)
Balance at End of Year	199,000	162,000	149,000
Inventory Valuation Reserve [Member]
Year ended 2013
Balance at the Beginning of Year	408,000	693,000	753,000
Additions Charged to Costs and Expense	164,000	58,000	45,000
Deductions	(40,000)	(343,000)	(105,000)
Balance at End of Year	532,000	408,000	693,000
Valuation Allowance of Deferred Tax Assets [Member]
Year ended 2013
Balance at the Beginning of Year	1,143,000	699,000	758,000
Additions Charged to Costs and Expense	1,457,000	444,000
Deductions			(59,000)
Balance at End of Year	$ 2,600,000	$ 1,143,000	$ 699,000