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Note 10 - Debt (Details Textual)
1 Months Ended 3 Months Ended 9 Months Ended
Dec. 31, 2019
USD ($)
Nov. 22, 2011
USD ($)
Jan. 31, 2018
Mar. 31, 2020
USD ($)
Mar. 31, 2019
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Dec. 30, 2019
USD ($)
Jan. 01, 2018
USD ($)
Line of Credit Facility, Maximum Borrowing Capacity $ 25,000,000     $ 25,000,000   $ 25,000,000   $ 23,000,000 $ 23,000,000
Repayments of Long-term Debt, Total           4,666,000 $ 3,227,000    
Debt Agreement Covenants, Fixed Charge Coverage Ratio, Minimum 0.0667                
Debt Agreement Covenants, Consolidated Cash and Available Credit Line, Minimum $ 7,500,000                
Line of Credit Facility, Interest Rate During Period       3.50% 3.90%        
Long-term Line of Credit, Total       $ 19,400,000   $ 19,400,000      
Line of Credit Facility, Commitment Fee Percentage           0.25%      
Minimum Consolidated Cash and Liquid Investments Pursuant to New Loan and Security Agreement           $ 10,000,000      
Maximum [Member]                  
Current Funded Debt to EBITDA Ratio           2.25      
Annual Capital Expenditures           $ 15,000,000      
Debt Service Coverage Rate           1.25      
Minimum [Member]                  
Current Funded Debt to EBITDA Ratio           1      
Debt Service Coverage Rate           1      
London Interbank Offered Rate (LIBOR) [Member]                  
Debt Instrument, Basis Spread on Variable Rate     1.50%            
Brazil Loans [Member]                  
Debt Instrument, Increase (Decrease), Net, Total       200,000          
All Debt [Member]                  
Debt Instrument, Increase (Decrease), Net, Total       5,700,000   $ 6,900,000      
Term Loan [Member]                  
Debt Instrument, Face Amount $ 10,000,000                
Debt Instrument, Term (Year) 5 years                
Debt Instrument, Interest Rate, Stated Percentage 4.00%                
Credit Limit for External Borrowing $ 5,000,000             $ 2,500,000  
Bytewise Term Loan [Member]                  
Debt Instrument, Face Amount   $ 15,500,000              
Debt Instrument, Term (Year)   10 years              
Debt Instrument, Interest Rate, Stated Percentage   4.50%              
Repayments of Long-term Debt, Total       3,500,000          
Debt Instrument, Periodic Payment, Total   $ 160,640              
Long-term Debt, Total $ 3,500,000                
Loan and Security Agreement Term Loan [Member]                  
Debt Agreement, Remaining Borrowing Capacity       6,500,000          
Line of Credit [Member]                  
Debt Instrument, Increase (Decrease), Net, Total       $ 2,500,000