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Note 3 - Stock-based Compensation Plans and Warrants (Details Textual) - USD ($)
1 Months Ended 9 Months Ended
Jan. 10, 2011
Jan. 14, 2010
Jun. 30, 2014
Dec. 18, 2009
Sep. 30, 2015
Sep. 30, 2014
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] | 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         11,850  
Two Thousand Nine Equity Incentive Plan [Member] | Common Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number         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, Options, Forfeitures in Period     45,235      
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  
Twenty Fourteen Equity Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period         81,250  
Twenty Fourteen Equity Incentive Plan [Member] | Accrues Yearly [Member] | Outside Director [Member]            
Officers' Compensation         $ 30,000  
Allocated Share-based Compensation Expense         20,000  
Twenty Fourteen Equity Incentive Plan [Member] | Accrues Quarterly [Member] | Outside Director [Member]            
Officers' Compensation         7,500  
Allocated Share-based Compensation Expense         $ 5,000  
Twenty Fourteen Equity Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized         675,000  
Employee Stock Option [Member]            
Allocated Share-based Compensation Expense         $ 0 $ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period         0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number         507,500  
Allocated Share-based Compensation Expense         $ 721,000 $ 544,000
Number Of Equity Incentive Plans         $ 2  
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period         75,445