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Note 10 - Stock-based Compensation Plans and Warrants (Details Textual) - USD ($) |  |  | 1 Months Ended | 12 Months Ended | 73 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jan. 10, 2011 | Jan. 14, 2010 | Jun. 30, 2014 | May. 31, 2014 | Dec. 18, 2009 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2015 | Dec. 31, 2012
Employee Stock Option [Member] | Two Thousand Nine Equity Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period |  |  |  |  | 10 years |  |  |  |  |  |  |
Employee Stock Option [Member] |  |  |  |  |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense |  |  |  |  |  | $ 0 |  | $ 0 | $ 43,000 |  |  |
Restricted Stock [Member] | Two Thousand Nine Equity Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  |  |  |  | 162,500 |  |  |  | 162,500 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures | 140,000 | 115,000 |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 595,000 |  |  |  |  |  |  |  |  |  |  |
Restricted Stock [Member] | Two Thousand Fourteen Equity Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period |  |  |  |  |  | 11,850 |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Twenty Fourteen Equity Incentive Plan [Member] | Water Project [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  |  |  |  | 200,000 |  |  |  | 200,000 |  |
Restricted Stock Units (RSUs) [Member] | Twenty Fourteen Equity Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period |  |  |  |  |  | 97,500 |  |  |  |  |  |
Two Thousand Nine Equity Incentive Plan [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |  |  |  |  |  | 507,500 |  |  |  | 507,500 |  |
Two Thousand Nine Equity Incentive Plan [Member] | Director [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period |  |  |  |  |  | 42,265 |  |  |  |  |  |
Two Thousand Nine Equity Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  |  |  | 850,000 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period |  |  |  |  |  |  |  |  |  | 537,500 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period |  |  | 45,235 | 20,000 |  |  |  |  |  |  |  |
Twenty Fourteen Equity Incentive Plan [Member] | Outside Director [Member] | Accrues Yearly [Member] |  |  |  |  |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense |  |  |  |  |  | $ 20,000 |  |  |  |  |  |
Officers' Compensation |  |  |  |  |  | 30,000 |  |  |  |  |  |
Twenty Fourteen Equity Incentive Plan [Member] | Outside Director [Member] | Accrues Quarterly [Member] |  |  |  |  |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense |  |  |  |  |  | 5,000 |  |  |  |  |  |
Officers' Compensation |  |  |  |  |  | $ 7,500 |  |  |  |  |  |
Twenty Fourteen Equity Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  |  |  |  | 675,000 |  |  |  | 675,000 |  |
Two Thousand Fourteen Equity Incentive Plan [Member] | Directors and Consultants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period |  |  |  |  |  | 132,303 |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price |  |  |  |  |  | $ 9.88 |  |  |  | $ 9.88 |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price |  |  |  |  |  | $ 12.51 |  |  |  | $ 12.51 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  |  |  |  |  | 0 |  |  |  |  |  |
Allocated Share-based Compensation Expense |  |  |  |  |  | $ 1,116,000 |  | $ 1,077,000 | $ 100,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |  |  |  |  |  | 507,500 | [1] | 822,500 | 842,500 | 507,500 | [1] | 862,500
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period |  |  |  |  |  | 155,609 |  | 81,827 |  |  |  |
Number Of Equity Incentive Plans |  |  |  |  |  | $ 2 |  |  |  | $ 2 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  |  |  | 0 |  | 0 | 0 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price |  |  |  |  |  | $ 11.66 |  | $ 11.82 | $ 11.84 | $ 11.66 |  | $ 11.92
[1] | Exercise prices vary from $9.88 to $12.51, and expiration dates vary from January 2020 to December 2021.

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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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