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Note 4 - Credit Facilities and Other Debt (Details Textual)
R$ in Millions, $ in Millions
3 Months Ended
Jan. 16, 2018
USD ($)
Mar. 31, 2018
USD ($)
Mar. 31, 2018
USD ($)
Mar. 31, 2018
USD ($)
Mar. 31, 2018
MXN ($)
Mar. 31, 2018
AUD ($)
Mar. 31, 2018
BRL (R$)
Jan. 09, 2018
USD ($)
Resource Plus Acquisition Note [Member]                
Notes Payable, Total               $ 2,700,000
Debt Instrument, Interest Rate, Stated Percentage   1.85% 1.85% 1.85% 1.85% 1.85% 1.85% 1.85%
Resource Plus, Inc [Member]                
Business Acquisition, Percentage of Voting Interests Acquired               51.00%
PNC Bank, National Association [Member]                
Debt Instrument, Interest Rate, Stated Percentage   4.383% 4.383% 4.383% 4.383% 4.383% 4.383%  
Fifth Third Bank [Member]                
Debt Instrument, Interest Rate, Stated Percentage   4.383% 4.383% 4.383% 4.383% 4.383% 4.383%  
National Australia Bank [Member]                
Debt Instrument, Interest Rate, Stated Percentage   6.30% 6.30% 6.30% 6.30% 6.30% 6.30%  
Itau Bank [Member]                
Line of Credit Facility, Maximum Borrowing Capacity   $ 1,200,000 $ 1,200,000 $ 1,200,000     R$ 4.0  
Long-term Line of Credit, Total   $ 0 $ 0 $ 0        
Percent Of Eligible Domestic Accounts Receivable Less Certain Reserves To Calculate Borrowing Availability   80.00% 80.00% 80.00% 80.00% 80.00% 80.00%  
Daycoval Bank [Member]                
Debt Instrument, Interest Rate, Stated Percentage   1.28% 1.28% 1.28% 1.28% 1.28% 1.28%  
Revolving Credit Facility [Member] | PNC Bank, National Association [Member]                
Line of Credit Facility, Maximum Borrowing Capacity $ 9,000,000              
Line of Credit Facility, Interest Rate at Period End   4.383% 4.383% 4.383% 4.383% 4.383% 4.383%  
Long-term Line of Credit, Total   $ 6,100,000 $ 6,100,000 $ 6,100,000        
Percent Of Eligible Domestic Accounts Receivable Less Certain Reserves To Calculate Borrowing Availability   85.00% 85.00% 85.00% 85.00% 85.00% 85.00%  
Proceeds from Long-term Lines of Credit $ 7,600,000              
Revolving Credit Facility [Member] | PNC Bank, National Association [Member] | London Interbank Offered Rate (LIBOR) [Member]                
Debt Instrument, Basis Spread on Variable Rate   2.50%            
Revolving Credit Facility [Member] | Fifth Third Bank [Member]                
Line of Credit Facility, Maximum Borrowing Capacity               $ 3,500,000
Line of Credit Facility, Interest Rate at Period End   4.383% 4.383% 4.383% 4.383% 4.383% 4.383%  
Long-term Line of Credit, Total   $ 780,000 $ 780,000 $ 780,000        
Percent Of Eligible Domestic Accounts Receivable Less Certain Reserves To Calculate Borrowing Availability               80.00%
Revolving Credit Facility [Member] | Fifth Third Bank [Member] | London Interbank Offered Rate (LIBOR) [Member]                
Debt Instrument, Basis Spread on Variable Rate       2.50%        
Revolving Credit Facility [Member] | National Australia Bank [Member]                
Line of Credit Facility, Maximum Borrowing Capacity   615,000 615,000 $ 615,000   $ 800,000    
Long-term Line of Credit, Total   $ 443,000 $ 443,000 $ 443,000        
Percent Of Eligible Domestic Accounts Receivable Less Certain Reserves To Calculate Borrowing Availability   80.00% 80.00% 80.00% 80.00% 80.00% 80.00%  
Revolving Credit Facility [Member] | Daycoval Bank [Member]                
Line of Credit Facility, Maximum Borrowing Capacity   $ 1,600,000 $ 1,600,000 $ 1,600,000     R$ 5.0  
Long-term Line of Credit, Total   $ 1,600,000 $ 1,600,000 $ 1,600,000     R$ 5.3  
Percent Of Eligible Domestic Accounts Receivable Less Certain Reserves To Calculate Borrowing Availability   80.00% 80.00% 80.00% 80.00% 80.00% 80.00%  
Revolving Credit Facility [Member] | BBVA Bancomer Bank [Member]                
Line of Credit Facility, Maximum Borrowing Capacity   $ 275,000 $ 275,000 $ 275,000 $ 5      
Line of Credit Facility, Interest Rate at Period End   5.00% 5.00% 5.00% 5.00% 5.00% 5.00%  
Long-term Line of Credit, Total   $ 0 $ 0 $ 0        
Revolving Credit Facility [Member] | BBVA Bancomer Bank [Member] | Interbank Interest Rate [Member]                
Debt Instrument, Basis Spread on Variable Rate     4.00%