Note 9 - Derivative Financial Instruments (Details) - Fair value of swaps recognized in accrued liabilities and in other comprehensive income (loss) (USD $)	3 Months Ended
	Sep. 30, 2013	Jun. 30, 2013
Note 9 - Derivative Financial Instruments (Details) - Fair value of swaps recognized in accrued liabilities and in other comprehensive income (loss) [Line Items]
Fair Value	$ (1,709,000)	$ (1,875,000)
June 1, 2010 (1) [Member]
Note 9 - Derivative Financial Instruments (Details) - Fair value of swaps recognized in accrued liabilities and in other comprehensive income (loss) [Line Items]
Notional Amount	5,000,000
Fixed Rate	2.495%
Maturity	May 24, 2015
Fair Value	(185,000)	(205,000)
June 1, 2010 (2) [Member]
Note 9 - Derivative Financial Instruments (Details) - Fair value of swaps recognized in accrued liabilities and in other comprehensive income (loss) [Line Items]
Notional Amount	5,000,000
Fixed Rate	2.495%
Maturity	May 24, 2015
Fair Value	(185,000)	(205,000)
June 8, 2010 [Member]
Note 9 - Derivative Financial Instruments (Details) - Fair value of swaps recognized in accrued liabilities and in other comprehensive income (loss) [Line Items]
Notional Amount	10,000,000
Fixed Rate	2.395%
Maturity	May 26, 2015
Fair Value	(352,000)	(389,000)
June 9, 2010 [Member]
Note 9 - Derivative Financial Instruments (Details) - Fair value of swaps recognized in accrued liabilities and in other comprehensive income (loss) [Line Items]
Notional Amount	5,000,000
Fixed Rate	2.34%
Maturity	May 26, 2015
Fair Value	(172,000)	(190,000)
June 18, 2010 [Member]
Note 9 - Derivative Financial Instruments (Details) - Fair value of swaps recognized in accrued liabilities and in other comprehensive income (loss) [Line Items]
Notional Amount	5,000,000
Fixed Rate	2.38%
Maturity	May 24, 2015
Fair Value	(175,000)	(194,000)
September 21, 2011 (1) [Member]
Note 9 - Derivative Financial Instruments (Details) - Fair value of swaps recognized in accrued liabilities and in other comprehensive income (loss) [Line Items]
Notional Amount	5,000,000
Fixed Rate	1.28%
Maturity	Sep. 21, 2013
Fair Value		(14,000)
September 21, 2011 (2) [Member]
Note 9 - Derivative Financial Instruments (Details) - Fair value of swaps recognized in accrued liabilities and in other comprehensive income (loss) [Line Items]
Notional Amount	5,000,000
Fixed Rate	1.595%
Maturity	Sep. 22, 2014
Fair Value	(69,000)	(83,000)
March 15, 2012 [Member]
Note 9 - Derivative Financial Instruments (Details) - Fair value of swaps recognized in accrued liabilities and in other comprehensive income (loss) [Line Items]
Notional Amount	10,000,000
Fixed Rate	2.745%
Maturity	Mar. 15, 2016
Fair Value	$ (571,000)	$ (595,000)