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Note 10 - Derivative Financial Instruments - Fair Value of Swaps Recognized in Accrued Liabilities and in Other Comprehensive Income (Loss) (Details) - USD ($)
9 Months Ended
Mar. 31, 2017
Jun. 30, 2016
Notional Amount $ 20,000
Fair Value (131,000) (1,038,000)
Interest Rate Swap Effective December 19, 2014 Number One [Member]    
Notional Amount $ 20,000,000  
Fixed Rate 1.18%  
Maturity Dec. 19, 2017  
Fair Value $ (4,000) (201,000)
Interest Rate Swap Effective December 19, 2014 Number Two [Member]    
Notional Amount $ 5,000,000  
Fixed Rate 1.20%  
Maturity Dec. 19, 2017  
Fair Value $ (2,000) (52,000)
Interest Rate Swap Effective December 18, 2015 [Member]    
Notional Amount $ 15,000,000  
Fixed Rate 1.46%  
Maturity Dec. 19, 2018  
Fair Value $ (17,000) (325,000)
Interest Rate Swap Effective December 19, 2015 [Member]    
Notional Amount $ 10,000,000  
Fixed Rate 2.01%  
Maturity Dec. 19, 2019  
Fair Value $ (108,000) $ (460,000)