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Note 3 - Stock-Based Compensation Plans and Warrants (Details) (USD $)
 1 Months Ended 3 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 9 Months Ended 0 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended 2 Months Ended 3 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended 57 Months Ended
Nov. 30, 2011
Mar. 31, 2013
Sep. 30, 2014
Sep. 30, 2013
Jun. 30, 2014
Mar. 31, 2014
Sep. 30, 2014
Water Project [Member]
Restricted Stock Units (RSUs) [Member]
2014 Equity Incentive Plan [Member]
Nov. 30, 2011
Private Placement [Member]
Warrants Issued For Every 3 Shares of Common Stock [Member]
Nov. 30, 2011
Private Placement [Member]
Sep. 30, 2014
Common Stock [Member]
2009 Equity Incentive Plan [Member]
Sep. 30, 2014
Common Stock [Member]
Dec. 31, 2009
Employee Stock Option [Member]
2009 Equity Incentive Plan [Member]
Sep. 30, 2014
Employee Stock Option [Member]
Sep. 30, 2013
Employee Stock Option [Member]
Sep. 30, 2014
Restricted Stock Units (RSUs) [Member]
Senior Management [Member]
2014 Equity Incentive Plan [Member]
Sep. 30, 2014
Restricted Stock Units (RSUs) [Member]
2014 Equity Incentive Plan [Member]
Jan. 10, 2011
Restricted Stock [Member]
2009 Equity Incentive Plan [Member]
Jan. 14, 2010
Restricted Stock [Member]
2009 Equity Incentive Plan [Member]
Jun. 30, 2014
Restricted Stock [Member]
2009 Equity Incentive Plan [Member]
Oct. 30, 2014
Subsequent Event [Member]
Mar. 31, 2014
Accrues Quarterly [Member]
Outside Director [Member]
2014 Equity Incentive Plan [Member]
Oct. 30, 2012
Term Loan [Member]
Sep. 30, 2014
Term Loan [Member]
Mar. 31, 2014
Outside Director [Member]
2014 Equity Incentive Plan [Member]
Sep. 30, 2014
Outside Director [Member]
2014 Equity Incentive Plan [Member]
Sep. 30, 2014
Director [Member]
2009 Equity Incentive Plan [Member]
Sep. 30, 2014
Director [Member]
2014 Equity Incentive Plan [Member]
Sep. 30, 2014
Directors and Consultants [Member]
2014 Equity Incentive Plan [Member]
Sep. 30, 2014
2003 Management Equity Incentive Plan [Member]
Jun. 30, 2014
2009 Equity Incentive Plan [Member]
May 31, 2014
2009 Equity Incentive Plan [Member]
Sep. 30, 2014
2009 Equity Incentive Plan [Member]
Sep. 30, 2014
2009 Equity Incentive Plan [Member]
Dec. 18, 2009
2009 Equity Incentive Plan [Member]
Sep. 30, 2014
2014 Equity Incentive Plan [Member]
Note 3 - Stock-Based Compensation Plans and Warrants (Details) [Line Items]                                                                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number         822,500         507,500                                     315,000            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized             200,000               162,500                                     850,000 675,000
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period                       10 years                                              
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period                 666,667                                 42,265 14,514 20,696         527,500    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period                                                           45,235 20,000        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period                               16,250                                      
Officers' Compensation (in Dollars)                                         $ 7,500       $ 30,000                    
Allocated Share-based Compensation Expense (in Dollars)     544,000 443,000                 0 39,000             5,000     20,000                      
Number Of Equity Incentive Plans           3                                                          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period     0                                                                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period                                 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, Options, Grants in Period, Net of Forfeitures                                                               507,500      
Proceeds from Issuance of Private Placement (in Dollars) 6,000,000                                                                    
Sale of Stock, Price Per Share (in Dollars per share)                 $ 9                                                    
Base For Issuing Purchase Warrants                 3                                                    
Warrant Issued               1                                                      
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right                 1                                                    
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per share)                 $ 13                         $ 10                          
Proceeds from Lines of Credit (in Dollars)   $ 17,500,000                                       $ 5,000,000                          
Class of Warrant or Right, Number of Securities Called by Warrants or Rights                                           250,000                          
Class of Warrant or Right, Exercise Term                                           2 years                          
Class of Warrant or Right, Exercised                                             137,500                        
Stock Issued During Period, Shares, Other                     24,441                       24,441                        
Class of Warrant or Right, Outstanding     334,723                                 222,223                              
Class of Warrant or Right, Expirations                                       112,500