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Short And Long-Term Debt (Narrative) (Details) - USD ($)
1 Months Ended 6 Months Ended
Mar. 31, 2015
Jun. 30, 2015
Feb. 28, 2015
Dec. 31, 2014
Federal Funds Rate [Member]        
Short And Long-Term Debt Instrument [Line Items]        
Basis spread on variable rate of debt instruments   0.50%    
Domestic Term-Loan [Member]        
Short And Long-Term Debt Instrument [Line Items]        
Loan amount   $ 5,000,000 $ 1,750,000  
Quarterly installments   $ 250,000    
Percentage of proceeds from certain asset sales required to pay down term loan   100.00%    
Seventh Amendment To The Loan And Security Agreement [Member]        
Short And Long-Term Debt Instrument [Line Items]        
Increase in the annual capital expenditure limit $ 4,500,000      
Seventh Amendment To The Loan And Security Agreement [Member] | Domestic Term-Loan [Member]        
Short And Long-Term Debt Instrument [Line Items]        
Loan amount 5,000,000      
Additional term loan facility borrowed 3,250,000      
Debt instrument maturity date   Feb. 28, 2019    
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Short And Long-Term Debt Instrument [Line Items]        
Basis spread on variable rate of debt instruments   2.50%    
Minimum [Member] | Federal Funds Rate [Member]        
Short And Long-Term Debt Instrument [Line Items]        
Basis spread on variable rate of debt instruments   0.00%    
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Short And Long-Term Debt Instrument [Line Items]        
Basis spread on variable rate of debt instruments   4.00%    
Maximum [Member] | Federal Funds Rate [Member]        
Short And Long-Term Debt Instrument [Line Items]        
Basis spread on variable rate of debt instruments   1.25%    
Maximum [Member] | Seventh Amendment To The Loan And Security Agreement [Member]        
Short And Long-Term Debt Instrument [Line Items]        
Investment spending prior to requiring bank approval $ 4,000,000      
Revolving Credit Facility [Member]        
Short And Long-Term Debt Instrument [Line Items]        
Credit facility, maximum borrowing capacity   $ 8,000,000    
Credit facility, non-use fee percentage   0.25%    
Weighted average interest rate of debt instruments   4.50%   4.51%
Credit facility, outstanding balance   $ 1,308,000   $ 3,843,000
Credit facility, available borrowing capacity   6,106,000   $ 3,456,000
Letters Of Credit [Member]        
Short And Long-Term Debt Instrument [Line Items]        
Credit facility, maximum borrowing capacity   $ 200,000    
International Credit Facility [Member]        
Short And Long-Term Debt Instrument [Line Items]        
Weighted average interest rate of debt instruments   3.47%   4.50%
Credit facility, outstanding balance   $ 912,000   $ 920,000
Credit facility, available borrowing capacity   $ 898,000   $ 956,000
Minimum interest rate of debt instruments   0.75%    
Maximum interest rate of debt instruments   2.50%