Annual report pursuant to Section 13 and 15(d)

Note 11 - Preferred Stock and Equity Offerings (Details Textual)

v3.7.0.1
Note 11 - Preferred Stock and Equity Offerings (Details Textual)
 1 Months Ended 3 Months Ended 12 Months Ended
Dec. 22, 2016
USD ($)
$ / shares
shares
Nov. 02, 2015
USD ($)
$ / shares
Feb. 03, 2017
Mar. 23, 2017
USD ($)
Feb. 28, 2017
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Preferred Stock, Shares Authorized | shares           5,000,000 5,000,000 5,000,000
Common Stock, Par or Stated Value Per Share | $ / shares           $ 0.01 $ 0.01 $ 0.01
Proceeds from Issuance of Common Stock | $             $ 1,707,000 $ 451,000
Preferred Stock, Shares Issued | shares           0 0 0
Preferred Stock, Shares Outstanding | shares           0 0 0
Subsequent Event [Member]                
Stock Issued During Period, Shares, New Issues | shares         3,100,000      
Proceeds from Issuance or Sale of Equity | $       $ 12,200,000        
Sale of Stock, Number of Direct Offerings     3          
Warrants Issued in Connection with 2016 Equity Offering [Member]                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares 160,000              
Class of Warrant or Right, Price of Common Stock Per Share Upon Exercise | $ / shares $ 5.20              
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 0.10              
2016 Equity Offering [Member]                
Stock Issued During Period, Shares, New Issues | shares 200,000              
Sale of Stock, Price Per Share | $ / shares $ 5.30              
Proceeds from Issuance or Sale of Equity | $ $ 1,900,000              
Proceeds From Issuance or Sale of Equity, Net | $ 1,700,000              
Payments of Stock Issuance Costs | $ $ 200,000              
2015 Equity Offering [Member]                
Common Stock, Par or Stated Value Per Share | $ / shares   $ 0.01            
Common Stock, Maximum Aggregate Offering Price Authorized | $   $ 5,000,000            
Sale of Stock, Number of Shares Issued in Transaction | shares           59,070 0  
Proceeds from Issuance of Common Stock | $           $ 500,000    
2015 Equity Offering [Member] | Cantor [Member]                
Sale of Stock, Commission Paid to Sales Agent, Percentage   3.00%