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Note 9 - Stock-based Compensation Plans and Warrants (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jan. 10, 2011
Jan. 14, 2010
Jun. 30, 2014
Dec. 18, 2009
Sep. 30, 2016
Jun. 30, 2016
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number               507,500 [1] 507,500 822,500 842,500
Allocated Share-based Compensation Expense         $ 520,000     $ 1,296,000 $ 1,116,000 $ 1,077,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price               $ 11.66 $ 11.66 $ 11.82 $ 11.84
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period               0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross               0 0 0  
Maximum [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price               $ 12.51      
Minimum [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price               $ 9.88      
Employee Stock Option [Member]                      
Allocated Share-based Compensation Expense               $ 0 $ 0 $ 0  
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, Options, Forfeitures in Period     45,235                
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] | 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] | Employee Stock Option [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period       10 years              
Two Thousand Nine Equity Incentive Plan [Member] | Employee Stock Option [Member] | Maximum [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       2 years              
Two Thousand Nine Equity Incentive Plan [Member] | Restricted Stock [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized               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                    
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period           17,365          
Twenty Fourteen Equity Incentive Plan [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized               675,000      
Twenty Fourteen Equity Incentive Plan [Member] | Outside Director [Member] | Accrues Yearly [Member]                      
Officers' Compensation               $ 30,000      
Allocated Share-based Compensation Expense               20,000      
Twenty Fourteen Equity Incentive Plan [Member] | Outside Director [Member] | Accrues Quarterly [Member]                      
Officers' Compensation               7,500      
Allocated Share-based Compensation Expense               $ 5,000      
Twenty Fourteen Equity Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member] | Water Project [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized     200,000         200,000      
Two Thousand Fourteen Equity Incentive Plan [Member] | Directors and Consultants [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period               208,186      
[1] Exercise Prices vary from $9.88 to $12.51, and expiration dates vary from January 2020 to December 2021.