Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)		12 Months Ended
		Dec. 31, 2015		Dec. 31, 2014	Dec. 31, 2013
Allowance for Doubtful Accounts [Member]
Balance at beginning of period		$ 172,000		$ 172,000	$ 172,000
Additions charged to costs and expenses		0		0	0
Deductions		(72,000)	[1]	0	0
Balance at end of period		100,000		172,000	172,000
Reserve for Excess and Obsolete Inventory [Member]
Balance at beginning of period		6,691,000		3,978,000	5,887,000
Additions charged to costs and expenses		525,000		3,010,000	122,000
Deductions	[2]	(1,110,000)		(297,000)	(2,031,000)
Balance at end of period		$ 6,106,000		$ 6,691,000	$ 3,978,000

[1] Reduction to allowance for doubtful accounts offset to Selling and Administrative expenses on the Company’s consolidated financial statements of operations.

[2] Inventory write-offs to the reserve account.