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Note 3 - Segment Reporting Information (Details Textual) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Jun. 30, 2015
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Phillips 66 [Member] |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  | 10.00% |  |
Revenue, Net |  |  |  | $ 17,045,000 |  |
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] |  |  |  |  |  |
Concentration Risk, Percentage |  | 0.00% | 0.00% |  | 0.00% |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Phillips 66 [Member] |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  | 11.00% |  |
Accounts, Notes, Loans and Financing Receivable, Net, Current |  | $ 4,690,000 |  | $ 4,690,000 |  |
Accounts Receivable [Member] | Customer Concentration Risk [Member] |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  | 0.00%
CANADA |  |  |  |  |  |
Number of Operating Segments |  |  |  | 1 |  |
Revenue, Net | [1] |  |  |  | $ 41,000 |
Number of Operating Segments |  |  |  | 3 |  |
Revenue, Net | [1] | 84,687,000 | $ 84,715,000 | $ 170,612,000 | $ 163,181,000 |
Accounts, Notes, Loans and Financing Receivable, Net, Current |  | $ 43,122,000 |  | $ 43,122,000 |  | $ 43,661,000
Intersegment Revenue Markup Percentage |  |  |  | 10.00% |  |
[1] | Net sales are attributed to geographic areas based upon the location of the operation making the sale.

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- Definition The aggregate of amounts due from customers or clients, within one year of the balance sheet date (or one operating cycle, if longer), for goods or services that have been delivered or sold in the normal course of business and an amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date within one year of the balance sheet, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection and net of any write-downs taken for collection uncertainty on the part of the holder, respectively. + 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 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13537-108611 + Details
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