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Note 7 - Shareholders' Equity (Details Textual) - USD ($)
1 Months Ended 12 Months Ended
Jan. 01, 2022
Jun. 18, 2021
Oct. 05, 2020
Sep. 30, 2020
Sep. 23, 2020
Jan. 31, 2022
Jun. 30, 2022
Jun. 30, 2021
Sep. 14, 2020
Nov. 13, 2019
Common Stock, Shares Authorized (in shares)             45,000,000 45,000,000    
Preferred Stock, Shares Authorized (in shares)             15,000,000 15,000,000    
Common Stock, Shares, Outstanding, Ending Balance (in shares)             6,769,923 6,675,746    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)             100,000 100,000   100,000
Preferred Stock, Shares Issued, Total (in shares)             0      
Payment, Tax Withholding, Share-Based Payment Arrangement             $ 779,622 $ 876,551    
Rights Agreement, Number of Preferred Stock Issuable Per Right (in shares)     0.001              
Rights Agreement, Exercise Price (in dollars per share)     $ 100.00              
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         $ 1,000,000.0          
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%              
Director [Member]                    
Payment, Tax Withholding, Share-Based Payment Arrangement             $ 1,538,560 $ (0)    
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)   $ 21.00     $ 13.25          
Proceeds from Issuance of Common Stock   $ 11,000,000.0                
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         $ 50,000.00          
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            
Restricted Stock [Member]                    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)             316,334      
Restricted Stock [Member] | Director [Member]                    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares) 160,000                  
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares) 60,100                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Intrinsic Value, Amount Per Share (in dollars per share) $ 25.60                  
Payment, Tax Withholding, Share-Based Payment Arrangement $ 1,500,000                  
Restricted Stock [Member] | Employee [Member]                    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)           68,833        
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)           27,805        
Payment, Tax Withholding, Share-Based Payment Arrangement           $ 700,000