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Note 8 - Common Stock (Details Textual)
$ / shares in Units, $ in Millions
 12 Months Ended
Jan. 31, 2013
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Common Stock, Shares Authorized   70,000,000 70,000,000
Common Stock, Par or Stated Value Per Share | $ / shares   $ 0.01 $ 0.01
Common Stock, Shares, Issued, Total   28,480,567 24,654,911
Common Stock, Capital Shares Reserved for Future Issuance 400,000    
Percentage Of Projects Annual Capacity 51.00%    
Number of Milestones for Common Stock Issuance 4    
Shares Payable Term From Date Earned 3 years    
Common Stock, Shares, Outstanding, Ending Balance   28,480,567 24,654,911
Water Project with Brownstein [Member]      
Related Party Transaction, Expenses from Transactions with Related Party | $   $ 2.3 $ 1.9
Shares Earned Upon Execution Of The Revised Agreement [Member]      
Common Stock, Capital Shares Reserved for Future Issuance 100,000    
Shares Earned Upon Receipt By The Company [Member]      
Common Stock, Capital Shares Reserved for Future Issuance 100,000    
Shares Earned Upon The Signing Of Binding Agreements [Member]      
Common Stock, Capital Shares Reserved for Future Issuance 100,000    
Shares Earned Upon The Commencement Of Construction [Member]      
Common Stock, Capital Shares Reserved for Future Issuance 100,000