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Schedule II - Valuation and Qualifying Accounts: (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Allowance for Doubtful Accounts [Member]
    
Valuation and Qualifying Accounts Disclosure [Line Items]    
Balance at beginning of year $ 99,000 $ 67,000
Charged to expenses 138,000 30,000
Written off (20,000) 2,000
Balance at end of year 217,000 99,000
Inventory Valuation Reserve [Member]
    
Valuation and Qualifying Accounts Disclosure [Line Items]    
Balance at beginning of year 636,000 384,000
Charged to expenses 101,000 252,000
Written off 1,000 0
Balance at end of year $ 738,000 $ 636,000