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Note 6 - Financial Instruments and Fair Value (Detail) - Derivative Financial Instruments (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Notional Amount	$ 42,600
Interest Rate Swap Agreement 1 [Member]
Notional Amount	2,074
Fixed Interest Rate	5.075%
Underlying Rate	3 month LIBOR
Expiration Date	Jul. 01, 2015
Fair Value	(100)
Interest Rate Swap Agreement 2 [Member]
Notional Amount	4,284
Fixed Interest Rate	5.075%
Underlying Rate	3 month LIBOR
Expiration Date	Jul. 01, 2015
Fair Value	(205)
Interest Rate Swap Agreement 3 [Member]
Notional Amount	7,444
Fixed Interest Rate	5.39%
Underlying Rate	1 month LIBOR
Expiration Date	Dec. 31, 2014
Fair Value	(326)
Interest Rate Swap Agreement 4 [Member]
Notional Amount	1,439
Fixed Interest Rate	5.39%
Underlying Rate	1 month LIBOR
Expiration Date	Dec. 31, 2014
Fair Value	(63)
Interest Rate Swap Agreement 5 [Member]
Notional Amount	2,561
Fixed Interest Rate	5.39%
Underlying Rate	1 month LIBOR
Expiration Date	Dec. 31, 2014
Fair Value	(112)
Interest Rate Swap Agreement 6 [Member]
Notional Amount	5,796
Fixed Interest Rate	5.39%
Underlying Rate	1 month LIBOR
Expiration Date	Dec. 31, 2014
Fair Value	(254)
Interest Rate Swap Agreement 7 [Member]
Notional Amount	5,304
Fixed Interest Rate	5.38%
Underlying Rate	1 month LIBOR
Expiration Date	Jun. 29, 2015
Fair Value	(304)
Interest Rate Swap Agreement 8 [Member]
Notional Amount	816
Fixed Interest Rate	5.29%
Underlying Rate	1 month LIBOR
Expiration Date	Jun. 30, 2015
Fair Value	(47)
Interest Rate Swap Agreement 9 [Member]
Notional Amount	1,564
Fixed Interest Rate	5.29%
Underlying Rate	1 month LIBOR
Expiration Date	Jun. 30, 2015
Fair Value	(89)
Interest Rate Swap Agreement 10 [Member]
Notional Amount	7,888
Fixed Interest Rate	5.29%
Underlying Rate	1 month LIBOR
Expiration Date	Jun. 30, 2015
Fair Value	(448)
Interest Rate Swap Agreement 11 [Member]
Notional Amount	680
Fixed Interest Rate	5.29%
Underlying Rate	1 month LIBOR
Expiration Date	Jun. 30, 2015
Fair Value	(39)
Interest Rate Swap Agreement 12 [Member]
Notional Amount	2,734
Fixed Interest Rate	5.29%
Underlying Rate	1 month LIBOR
Expiration Date	Jun. 30, 2015
Fair Value	$ (155)

X

- Definition

Fair value of all liability derivatives designated as cash flow hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 107

-Paragraph 10

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Name:	us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The reference rate for the variable rate of the interest rate derivative, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeDescriptionOfVariableRateBasis
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Date the derivative contract matures, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeMaturityDates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Fixed interest rate that will be received or paid upon exercise of the interest rate swaption contract.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeSwaptionInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Aggregate notional amount of all interest rate derivatives designated as hedging instruments in cash flow hedges. Notional amount refers to the monetary amount specified in the interest rate derivative contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Notional Amount

-URI http://asc.fasb.org/extlink&oid=6519104



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1B

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959

+ Details

Name:	us-gaap_NotionalAmountOfInterestRateCashFlowHedgeDerivatives
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant