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Note 8 - Debt (Details Textual)
9 Months Ended
Nov. 22, 2011
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2016
Line of Credit Facility, Maximum Borrowing Capacity   $ 23,000,000  
Line of Credit Facility, Interest Rate During Period   2.50% 2.20%
Long-term Line of Credit   $ 9,400,000  
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  
Line of Credit [Member]      
Debt Instrument, Term   3 years  
Term Loan [Member]      
Debt Instrument, Term 10 years    
Long-term Line of Credit   $ 8,100,000  
Debt Instrument, Face Amount $ 15,500,000    
Debt Instrument, Interest Rate, Stated Percentage 4.50%    
Line of Credit Facility, Periodic Payment $ 160,600    
London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument, Basis Spread on Variable Rate   1.50%