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Note 2 - Long-Term Debt (Details Textual)
1 Months Ended 6 Months Ended 24 Months Ended
Jul. 31, 2018
USD ($)
Jul. 31, 2013
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
May. 01, 2014
USD ($)
Oct. 22, 2013
USD ($)
Sep. 30, 2013
USD ($)
Jun. 30, 2013
USD ($)
Amended Credit Agreement [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]                
Debt Instrument, Basis Spread on Variable Rate     0.95%          
Debt Instrument, Interest Rate, Stated Percentage     1.20% 1.20%        
Amended Credit Agreement [Member] | Revolving Credit Facility [Member]                
Letters of Credit Outstanding, Amount     $ 0 $ 0        
Line of Credit Facility, Maximum Borrowing Capacity               $ 15,000,000
Line of Credit Facility, Commitment Fee Percentage     0.10%          
Permitted Investments In Subsidiaries           $ 5,000,000 $ 1,000,000  
Amended Credit Agreement [Member] | Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member]                
Debt Instrument, Basis Spread on Variable Rate     0.95%          
Debt Instrument, Interest Rate, Stated Percentage     1.14% 1.14%        
Amended Credit Agreement [Member] | Term Loan [Member]                
Debt Instrument, Face Amount               $ 30,000,000
Scenario, Forecast [Member]                
Debt Instrument, Periodic Payment, Principal $ 3,250,000              
Add on Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]                
Debt Instrument, Basis Spread on Variable Rate     0.95%          
Debt Instrument, Interest Rate, Stated Percentage     1.20% 1.20%        
Add on Credit Facility [Member]                
Line of Credit Facility, Maximum Borrowing Capacity         $ 10,000,000      
Line of Credit Facility, Commitment Fee Percentage     0.50%          
Per Month through July 1, 2015 [Member]                
Debt Instrument, Periodic Payment, Principal   $ 187,500            
Per Month through June 1, 2018 [Member]                
Debt Instrument, Periodic Payment, Principal   $ 250,000            
Interest Rate Swap [Member]                
Interest Rate Derivative Assets, at Fair Value     $ (173,000) $ (173,000)        
Increase (Decrease) in Derivative Assets       173,000        
Other Tax Expense (Benefit)       $ 61,000        
Senior Debt [Member]                
Ratio of Maximum Funded Indebtedness to EBITDA     3.5 3.5        
Derivative, Fixed Interest Rate   2.53%            
Derivative, Notional Amount   $ 14,250,000            
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year     $ 1,437,000 $ 1,437,000        
Long-term Debt, Maturities, Repayments of Principal in Year Two     3,000,000 3,000,000        
Long-term Debt, Maturities, Repayments of Principal in Year Three     3,000,000 3,000,000        
Long-term Debt, Maturities, Repayments of Principal in Year Four     16,000,000 $ 16,000,000        
Debt Issuance Cost     $ 68,000          
Ratio of Maximum Funded Indebtedness to EBITDA     4 4        
Fixed Charges Numerator     1.25 1.25