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Loans receivable (Details) (USD $) | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Notes and Loans Receivable Gross | $ 10,840,811 | $ 12,602,473
Less current portion | 1,812,532 | 1,843,600
Loans receivable, excluding current portion | 9,028,279 | 10,758,873
Two loans originally aggregating $10,996,290, bearing interest at 6.5% per annum, receivable in monthly installments of $124,827 to May 2019, and secured by the machinery and equipment of the North Side Water Works plant [Member] |  |
Notes and Loans Receivable Gross | 7,925,386 | 8,798,106
Two loans originally aggregating $1,738,000, bearing interest at 5% per annum, receivable in monthly installments of $24,565 to March 2014, and secured by the machinery and equipment of the North Sound plant [Member] |  |
Notes and Loans Receivable Gross | 356,474 | 626,070
Two loans originally aggregating $3,671,039, bearing interest at 6.5% per annum, receivable in monthly installments of $54,513 to June 2017, and secured by the machinery and equipment of the Red Gate plant [Member] |  |
Notes and Loans Receivable Gross | 2,546,325 | 3,018,190
Two loans originally aggregating $897,000, bearing interest at 5% per annum, receivable in monthly installments of $12,678 to January 2013, and secured by the machinery and equipment of the Lower Valley plant [Member] |  |
Notes and Loans Receivable Gross | $ 12,626 | $ 160,107

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- Definition 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. This amount does not include amounts related to receivables held-for-sale. + References No definition available. + Details
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- Definition An amount representing an agreement for an unconditional promise by the maker to pay the Company (holder) a definite sum of money within one year from the balance sheet date (or the normal operating cycle, whichever is longer), net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6375948&loc=d3e4531-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6361293&loc=d3e6676-107765 Reference 3: 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Section A -Paragraph 4 -Chapter 3 -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
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- Definition 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 more than one year from the balance sheet date, net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale. + 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 210.5-02.17) -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 17 -Article 5 + Details
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