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Note 8 - Stock Incentive Plans (Details Textual)
3 Months Ended 9 Months Ended 12 Months Ended
Nov. 07, 2016
USD ($)
$ / shares
shares
Sep. 30, 2016
USD ($)
shares
Sep. 28, 2016
USD ($)
shares
Aug. 05, 2016
Oct. 15, 2014
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
shares
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
$ / shares
shares
Sep. 30, 2015
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Reverse Stock Split [Member]                          
Stockholders' Equity Note, Stock Split, Conversion Ratio       20                  
Management Incentive Plan 2014 [Member] | With Different Striking Prices [Member]                          
Percent of Common Stock for Distribution         5.50%                
Management Incentive Plan 2014 [Member] | Annual Installments [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage         25.00%                
Management Incentive Plan 2014 [Member] | General and Administrative Expense [Member]                          
Allocated Share-based Compensation Expense | $             $ (734,996) $ 790,803 $ 933,550 $ 2,998,382      
Management Incentive Plan 2014 [Member] | Restricted Stock [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period                 4 years        
Management Incentive Plan 2014 [Member]                          
Percent of Common Stock for Distribution         2.00%                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period         4 years                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number   26,147         26,147   26,147        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Remaining Contractual Term                 4 years        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term                 7 years        
Former Chief Financial Officer [Member] | General and Administrative Expense [Member]                          
Non-cash Compensation Expense, Reversed Recognition | $             $ 1,400,000            
Former Chief Financial Officer [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period, Lump Sum Payment | $     $ 33,000                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period     4,125                    
Chief Financial Officer [Member] | Employee Stock Option [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period   5 years                      
Chief Financial Officer [Member] | Restricted Stock [Member] | Subsequent Event [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 233,863                        
Chief Financial Officer [Member] | Subsequent Event [Member]                          
Stock Issued During Period, Value, Restricted Stock Award, Gross | $ $ 1,000,000                        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 280,000                        
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares $ 4.28                        
Chief Financial Officer [Member]                          
Stock Issued During Period, Value, Restricted Stock Award, Gross | $   $ 1,000,000                      
Average Closing Price Per Share, Number of Trading Days, Proceeding Grant Date   10 days                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross   280,000                      
Employee [Member] | Restricted Stock [Member] | Subsequent Event [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 131,197                        
Scenario, Forecast [Member]                          
Allocated Share-based Compensation Expense | $           $ 421,618         $ 56,524 $ 489,063 $ 1,196,958
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options   56,987         56,987   56,987        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit | $ / shares                 $ 78.40        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit | $ / shares                 $ 505