Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity (Cantor Fitzgerald Underwriting) (Narrative) (Details)

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Stockholders' Equity (Cantor Fitzgerald Underwriting) (Narrative) (Details) - USD ($)
 12 Months Ended
Mar. 07, 2021
Feb. 24, 2021
Jan. 11, 2021
Dec. 10, 2020
Dec. 08, 2020
Jun. 30, 2020
Oct. 29, 2019
Jun. 30, 2021
Jun. 30, 2020
Nov. 25, 2020
Proceeds from sale of shares, gross           $ 18,400,000 $ 5,000,000      
Cost related to issuance of shares               $ 4,713,000 $ 2,170,000  
Sales Agreement [Member] | Cantor Fitzgerald [Member]                    
Aggregate value of shares offered for sale                   $ 100,000,000
Underwritten Public Offering [Member] | Cantor Fitzgerald [Member]                    
Number of shares agreed to be issued, maximum         29,661,017          
Proceeds from sale of shares, net of issuance cost $ 2,995,000 $ 238,000 $ 4,600,000              
Number of shares issued 1,716,800 113,200 4,240,828 29,660,000            
Proceeds from sale of shares, gross       $ 35,200,000            
Cost related to issuance of shares       $ 2,900,000            
Over-Allotment Option [Member] | Cantor Fitzgerald [Member]                    
Number of shares agreed to be issued, maximum         4,449,152