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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.