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Note 8 - Shareholders' Equity (Details Textual) - USD ($)
1 Months Ended 6 Months Ended
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Jun. 30, 2016
Mar. 31, 2013
Common Stock, Shares Authorized   30,000,000   30,000,000  
Preferred Stock, Shares Authorized   15,000,000      
Common Stock, Shares, Outstanding   4,903,766   3,958,540  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights   887,999      
Common Stock, Par or Stated Value Per Share $ 0.01 $ 0.01   $ 0.01  
Proceeds from Warrant Exercises   $ 5,287,500    
Preferred Stock, Shares Issued   0      
March 2013 Warrant [Member]          
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 9       $ 10
Class of Warrant or Right, Exercised During Period 587,500        
Proceeds from Warrant Exercises $ 5,300,000        
March 2013 Warrant [Member] | Entities Controlled by CEO [Member]          
Class of Warrant or Right, Exercised During Period 83,334        
Rights to Purchase Series A Junior Preferred Stock [Member]          
Class of Warrant or Right, Number of Securities Called by Warrants or Rights   0.01      
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 80      
Beneficial Ownership Required for Rights to Be Exercisable   23.00%      
Class of Warrant or Right, Distributed for Each Share of Common Stock   1      
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number   208,997