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Note 10 - Debt (Details Textual)
1 Months Ended 3 Months Ended
Nov. 22, 2011
USD ($)
Jan. 31, 2018
Sep. 30, 2019
USD ($)
Sep. 30, 2018
Jun. 30, 2019
USD ($)
Jan. 01, 2018
USD ($)
Line of Credit Facility, Maximum Borrowing Capacity           $ 23,000,000
Line of Credit Facility, Interest Rate During Period     3.90% 3.80%    
Long-term Line of Credit, Total     $ 16,900,000      
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      
Long-term Debt, Total     23,067,000   $ 21,606,000  
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, Total $ 160,640          
Long-term Debt, Total     $ 4,000,000      
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%