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Note 13 - Subsequent Events (Details Textual) - USD ($)
3 Months Ended
May 11, 2017
May 02, 2017
Apr. 28, 2017
Apr. 10, 2017
Mar. 31, 2017
Employee Stock Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures         0
Subsequent Event [Member]          
Committed Equity Facility Amount   $ 5,000,000      
Committed Equity Facility, Term   3 years      
Maximum Dollar Amount of Shares to Purchase Based on Daily Volume Weighted Average Price of the Company’s Common Stock   $ 100,000      
Period for Maximum Dollar Amount of Shares to Purchase   5 days      
Percentage of Lowest VWAP That Equals or Exceeds Specified per Share Price under Committed Equity Facility   94.00%      
Per Share Price That Is Used in Calculation for Purchase Price under Committed Equity Facility   $ 3.83      
Equity Facility, Aggregate Sales Limitation, Percentage of Total Outstanding Share   19.99%      
Maximum Ownership of Company’s Common Stock Requirement under Committed Equity Facility Sale, Percentage   9.99%      
Stock Issued During Period As a Commitment Fee, Shares   55,000      
Subsequent Event [Member] | Director [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures       10,000  
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price       $ 2.64  
Stock Issued During Period, Shares, Issued for Services 1,925        
Subsequent Event [Member] | Director [Member] | Employee Stock Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       3 years  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period       7 years  
Subsequent Event [Member] | Director and Executive Officer [member]          
Stock Issued During Period, Shares, New Issues     277,778    
Share Price     $ 3.60    
Proceeds from Issuance of Common Stock     $ 1,000,000