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Note 7 - Revolving Credit Facility Narrative (Details) (USD $)	3 Months Ended
	Jun. 30, 2012
Date borrowing capacity was expanded	May 18, 2012
Previous borrowing capacity	$ 50,000,000
Current borrowing capacity	$ 100,000,000

X

- Definition

Date expanded existing bank credit facility

+ References

No definition available.

+ Details

Name:	fil_DateBorrowingCapacityWasExpanded
Namespace Prefix:	fil_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line of credit facility, previous borrowing capacity

+ References

No definition available.

+ Details

Name:	fil_LineOfCreditFacilityPreviousBorrowingCapacity
Namespace Prefix:	fil_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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