Note 6 - Notes Payable (Detail) - Notes Payable (Parentheticals) (USD $)				12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 19, 2008	Dec. 31, 2012 US Bank Refinanced [Member]	Dec. 31, 2011 US Bank Refinanced [Member]	Dec. 31, 2012 US Bank [Member]	Dec. 31, 2011 US Bank [Member]
Revolving credit note with US Bank, maximum available	$ 6,500,000	$ 6,500,000
Monthly Principal and Interest Payments				80,104	80,104	121,190	121,190
Note payable to US bank, original amount			$ 9,000,000	$ 6,900,000	$ 6,900,000	$ 10,000,000	$ 10,000,000
Interest Rate				3.79%	3.79%	3.79%	3.79%

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

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