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Note 6 - Shareholders' Equity (Details Textual) - USD ($)
 1 Months Ended 12 Months Ended
Jun. 18, 2021
Oct. 05, 2020
Sep. 30, 2020
Sep. 23, 2020
Sep. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 11, 2020
Sep. 14, 2020
Common Stock, Shares Authorized (in shares)           45,000,000 45,000,000 30,000,000  
Preferred Stock, Shares Authorized (in shares)           15,000,000 15,000,000    
Common Stock, Shares, Outstanding, Ending Balance (in shares)           6,675,746 6,557,239    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)           100,000 100,000    
Preferred Stock, Shares Issued, Total (in shares)           0      
Proceeds from Issuance of Common Stock, Net           $ 14,111,410    
Common Stock, Par or Stated Value Per Share (in dollars per share)   $ 0.01 $ 0.01   $ 0.01 $ 0.01 $ 0.01    
Rights Agreement Term (Year)   1 year              
Rights Agreement, Number of Preferred Stock Issuable Per Right (in shares)   0.001              
Rights Agreement, Exercise Price (in dollars per share)   $ 100              
Rights to Purchase Series A Junior Preferred Stock [Member]                  
Class of Warrant or Right, Distributed for Each Share of Common Stock (in shares)                 1
Chief Executive Officer [Member]                  
Stock Issued During Period, Shares, New Issues (in shares)       75,472          
Stock Issued During Period, Value, New Issues       $ 1,000,000          
Person or Group [Member]                  
Rights Agreement, Beneficial Ownership Percentage of Common Stock,Threshold   18.00%              
Certain Passive Investors [Member]                  
Rights Agreement, Beneficial Ownership Percentage of Common Stock,Threshold   20.00%              
Private Placement [Member]                  
Stock Issued During Period, Shares, New Issues (in shares) 523,809     247,172          
Shares Issued, Price Per Share (in dollars per share) $ 21     $ 13.25          
Proceeds from Issuance of Common Stock $ 11,000,000                
Proceeds from Issuance of Common Stock, Net $ 10,900,000                
Stock Issued During Period, Shares, Treasury Stock Reissued (in shares)       32,874          
Proceeds from Issuance of Private Placement       $ 3,300,000          
Proceeds from Issuance of Private Placement, Net of Issuance Costs       3,200,000          
Payments of Stock Issuance Costs       $ 50,000          
Private Placement [Member] | Chief Executive Officer [Member]                  
Stock Issued During Period, Shares, New Issues (in shares) 47,619                
Stock Issued During Period, Value, New Issues $ 1,000,000                
Private Placement [Member] | Petrie Partners Securities, LLC [Member]                  
Private Placement Fee, Percentage       3.25%          
Payments of Stock Issuance Costs       $ 50,000          
Private Placement [Member] | Chief Executive Officer [Member]                  
Stock Issued During Period, Shares, New Issues (in shares) 47,619                
Stock Issued During Period, Value, New Issues $ 1,000,000                
CORE Alaska [Member] | The Joint Venture Company [Member]                  
Shares Received From Sale of Equity Method Investments (in shares)     809,744   809,744        
Restricted Stock [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)           401,333