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Note 8 - Debt (Details Textual)
3 Months Ended
Nov. 22, 2011
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
Jun. 30, 2017
USD ($)
Line of Credit Facility, Maximum Borrowing Capacity   $ 23,000,000    
Line of Credit Facility, Interest Rate During Period   3.10% 2.40%  
Long-term Line of Credit   $ 9,900,000    
Long-term Debt   17,212,000   $ 17,609,000
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    
Minimum [Member]        
Debt Service Coverage Rate   1.25    
Term Loan [Member]        
Debt Instrument, Face Amount $ 15,500,000      
Debt Instrument, Term 10 years      
Debt Instrument, Interest Rate, Stated Percentage 4.50%      
Debt Instrument, Periodic Payment $ 160,600      
Long-term Debt   $ 7,300,000    
London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument, Basis Spread on Variable Rate   1.50%