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Note 13 - Debt (Details Textual)
9 Months Ended 12 Months Ended
Nov. 22, 2011
USD ($)
Rate
Mar. 31, 2016
USD ($)
Jun. 30, 2016
USD ($)
London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument, Basis Spread on Variable Rate     1.50%
Maximum [Member] | Amended Agreement [Member]      
Current Funded Debt to EBITDA Ratio     2.25
Maximum [Member]      
Annual Capital Expenditures   $ 15,000,000  
Minimum [Member]      
Debt Service Coverage Rate   1.25  
Standby Letters of Credit [Member]      
Long-term Line of Credit     $ 900,000
Term Loan [Member]      
Debt Instrument, Face Amount $ 15,500,000    
Debt Instrument, Term 10 years    
Debt Instrument, Interest Rate, Stated Percentage | Rate 4.50%    
Line of Credit Facility, Periodic Payment $ 160,640    
Long-term Line of Credit     9,300,000
Line of Credit Facility, Maximum Borrowing Capacity     $ 23,000,000
Line of Credit Facility, Interest Rate During Period     2.20%
Minimum Consolidated Cash and Liquid Investments Pursuant to New Loan and Security Agreement   $ 10,000,000  
Long-term Line of Credit     $ 9,400,000
Line of Credit Facility, Commitment Fee Percentage     0.25%
Line of Credit Facility, Current Borrowing Capacity     $ 22,100,000
Line of Credit Facility, Remaining Borrowing Capacity     $ 12,700,000