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Note 5 - Derivative Financial Instruments (Details)	1 Months Ended		6 Months Ended
	Aug. 31, 2015 $ / gal gal	Jul. 31, 2015 $ / gal gal	Jun. 30, 2015 USD ($) gal	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Note 5 - Derivative Financial Instruments (Details) [Line Items]
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax			$ (18,000)		$ (101,000)
Price Risk Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net			$ (83,000)	$ 30,000
Derivative, Nonmonetary Notional Amount, Gallons (in US Gallons) | gal			20,000
Swap [Member] | Commodity [Member] | Scenario, Forecast [Member]
Note 5 - Derivative Financial Instruments (Details) [Line Items]
Derivative, Diesel Fuel Purchases, Monthly Volumes, Gallons (in US Gallons) | gal	10,000	10,000
Derivative, Diesel Fuel Purchases, Fixed Price Per Gallon (in Dollars per US Gallon) | $ / gal	2.75	2.75

X

- Definition

Represents the monthly fixed price per gallon of diesel fuel purchases.

+ References

No definition available.

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X

- Definition

Represents the number of gallons of monthly diesel fuel purchases.

+ References

No definition available.

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X

- Definition

The number of gallons in a derivative contract expressed in nonmonetary units. For example, the number of gallons specified in a fuel forward purchase contract.

+ References

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- References

No definition available.

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- Definition

Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 220



-SubTopic 10



-Section 45



-Paragraph 10A



-Subparagraph (d)



-URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580



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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 220



-SubTopic 10



-Section 45



-Paragraph 11



-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580



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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 220



-SubTopic 10



-Section 45



-Paragraph 14A



-URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580



Reference 4: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 220



-SubTopic 10



-Section 45



-Paragraph 14



-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580



Reference 5: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 815



-SubTopic 30



-Section 50



-Paragraph 2



-URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80784-113994

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- Definition

The amount of net gains or losses on price risk cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income.

+ References

No definition available.

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