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Note 8 - Stockholders' Equity (Details Textual) - USD ($)
$ / shares in Units, Pure in Thousands
 3 Months Ended 9 Months Ended
May 28, 2021
May 14, 2021
Feb. 04, 2021
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Nov. 30, 2019
Oct. 31, 2019
Jul. 31, 2016
Oct. 27, 2014
Preferred Stock, Shares Authorized (in shares)       1,000,000     1,000,000   1,000,000          
Preferred Stock, Par or Stated Value Per Share (in dollars per share)       $ 0.001     $ 0.001   $ 0.001          
Common Stock, Par or Stated Value Per Share (in dollars per share)     $ 0.001                      
Proceeds From Issuance of Common Stock, Net of Issuance Costs                 $ 0 $ 4,626,000        
Warrants and Rights Outstanding, Term (Year)       5 years         5 years          
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)       48,000       95,500   95,500        
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total       $ 0.5         $ 0.5          
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)                 2 years 3 months 10 days          
Warrants Exercisable Term (Month)                 6 months          
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)       $ 1.27                    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value       $ 0         $ 0          
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)                 8 years 8 months 12 days          
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term (Year)                 8 years 3 months 18 days          
Share-Based Payment Arrangement, Employee [Member]                            
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)                 5,000          
Share-Based Payment Arrangement, Option [Member]                            
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)       1,178,065     765,232   1,178,065          
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)                 535,000          
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)                 $ 1.82          
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)       3 years       3 years 3 years 3 years        
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Exercise Price (in dollars per share)       $ 3.99       $ 2.51 $ 3.99 $ 2.51        
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)                   10 years        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate (Rate)           0.00%                
Director [Member]                            
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)       120,000         120,000          
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)       $ 1.85                    
Director [Member] | Share-Based Payment Arrangement, Option [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate (Rate)                 0.00%          
Chief Executive Officer [Member]                            
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)       362,000                    
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)       $ 1.85                    
Chief Executive Officer [Member] | Share-Based Payment Arrangement, Option [Member]                            
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)       3 years                    
Amended and Restated Stock Incentive Plan [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)                         5,000  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)       1,226         1,226          
The 2016 Stock Incentive Plan [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)       1,650,000         1,650,000   800,000 10,000    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)       1,176,839         1,176,839          
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)       423,815         423,815          
Series D Preferred Stock Warrants [Member]                            
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)   0.5                        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)   592,106                        
Warrants and Rights Outstanding, Term (Year)   5 years 6 months                        
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)   $ 2.51                        
Placement Agent Warrants [Member]                            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)   179,536 58,169   179,536                  
Warrants and Rights Outstanding, Term (Year)   5 years 5 years                      
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)   $ 2.85 $ 3.875     $ 4.00                
Warrants or Rights, Exercised During Period (in shares)                 26,605          
Montage Warrant [Member]                            
Warrants and Rights Outstanding, Term (Year)       8 years         8 years          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)       $ 132.50         $ 132.50          
Class of Warrant or Right, Equity Buy-out       $ 250,000         $ 250,000          
Series A Warrants [Member]                            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)         872,625                  
Warrants and Rights Outstanding, Term (Year)           5 years 6 months                
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)           $ 4.00                
Series B Warrants [Member]                            
Warrants and Rights Outstanding, Term (Year)           24 months                
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)           $ 4.00                
Series C Warrants [Member]                            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)         13,738                  
Warrants and Rights Outstanding, Term (Year)           5 years 6 months                
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)           $ 0.05                
Series C Preferred Placement Agent Warrants [Member]                            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)         11,992                  
Investor Warrants [Member]                            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)         41,621                  
Series D Warrants [Member]                            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)         592,106                  
Warrants or Rights, Exercised During Period (in shares)         0                  
May 2021 Registered Offering [Member]                            
Stock Issued During Period, Shares, New Issues (in shares)   1,060,000                        
Shares Issued, Price Per Share (in dollars per share)   $ 2.28                        
Sale of Stock Agreement, Placement Fee Percentage (Rate)   8.00%                        
Proceeds from Issuance or Sale of Equity, Net   $ 4,300,000                        
Proceeds from Issuance of Common Stock   1,900,000                        
May 2021 Registered Offering [Member] | Series D Preferred Stock Warrants [Member]                            
Proceeds from Issuance or Sale of Equity, Total   $ 1,000,000.0                        
Registered Offering and Sale of Common Stock [Member]                            
Stock Issued During Period, Shares, New Issues (in shares)     880,000                      
Shares Issued, Price Per Share (in dollars per share)     $ 3.10                      
Sale of Stock Agreement, Placement Fee Percentage (Rate)     8.00%                      
Proceeds From Issuance of Common Stock, Net of Issuance Costs     $ 2,500,000                      
Series A Convertible Preferred Stock [Member]                            
Preferred Stock, Shares Authorized (in shares)                           264,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share)                           $ 10
Preferred Stock, Shares Outstanding, Ending Balance (in shares)       0         0          
Series B Convertible Preferred Stock [Member]                            
Preferred Stock, Shares Authorized (in shares)       5,000         5,000          
Preferred Stock, Par or Stated Value Per Share (in dollars per share)       $ 1,000         $ 1,000          
Series C Convertible Preferred Stock [Member]                            
Preferred Stock, Shares Authorized (in shares)       11,000     11,000   11,000          
Preferred Stock, Par or Stated Value Per Share (in dollars per share)       $ 1,000         $ 1,000          
Preferred Stock, Shares Outstanding, Ending Balance (in shares)       350     350   350          
Preferred Stock, Convertible, Shares Issuable (in shares)       38,889         38,889          
Series D Convertible Preferred Stock [Member]                            
Preferred Stock, Shares Authorized (in shares)       4,200     4,200   4,200          
Preferred Stock, Par or Stated Value Per Share (in dollars per share)   $ 1,000                        
Preferred Stock, Shares Outstanding, Ending Balance (in shares)   4,200   0     0   0          
Convertible Preferred Stock, Percent, Maximum Ownership (Rate)   4.99%                        
Convertible Preferred Stock, Percent, Maximum Ownership Upon Election (Rate)   9.99%                        
Preferred Stock, Convertible, Conversion Price (in dollars per share)           1.41                
Preferred Stock, Convertible, Commitment Conversion Price (in dollars per share)           $ 2.50                
Preferred Stock, Convertible, Beneficial Conversion Feature           $ 1,300,000                
Impact of Deemed Dividends             $ 2,000,000.0              
Series D Convertible Preferred Stock [Member] | Hawk Search [Member]                            
Shares Issued, Price Per Share (in dollars per share) $ 618                          
Convertible Preferred Stock, Embedded Beneficial Conversion Feature, Intrinsic Value $ 724,000                          
Series D Convertible Preferred Stock [Member] | May 2021 Registered Offering [Member]                            
Proceeds from Issuance or Sale of Equity, Total   $ 1,300,000                        
Series D Convertible Preferred Stock [Member] | Private Placement [Member]                            
Preferred Stock, Convertible, Shares Issuable (in shares)   1,184,211                        
Stock Issued During Period, Shares, New Issues (in shares)   2,700                        
Shares Issued, Price Per Share (in dollars per share)   $ 1,000