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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
Common Stock [Member]
Management [Member]
Restricted Stock Units (RSUs) [Member]
Common Stock [Member]
ATM [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Management [Member]
Restricted Stock Units (RSUs) [Member]
Additional Paid-in Capital [Member]
ATM [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Management [Member]
Restricted Stock Units (RSUs) [Member]
Retained Earnings [Member]
ATM [Member]
Retained Earnings [Member]
Management [Member]
Restricted Stock Units (RSUs) [Member]
ATM [Member]
Total
Balance (in shares) at Dec. 31, 2021     16,871,265                  
Balance at Dec. 31, 2021     $ 17,000     $ 139,055,000     $ (128,697,000)     $ 10,375,000
Share-based compensation           319,000           319,000
Net loss                 (3,325,000)     (3,325,000)
Share-based compensation           319,000           319,000
Balance (in shares) at Mar. 31, 2022     16,871,265                  
Balance at Mar. 31, 2022     $ 17,000     139,374,000     (132,022,000)     7,369,000
Balance (in shares) at Dec. 31, 2021     16,871,265                  
Balance at Dec. 31, 2021     $ 17,000     139,055,000     (128,697,000)     10,375,000
Net loss                       (5,822,000)
Balance (in shares) at Jun. 30, 2022     17,758,194,000                  
Balance at Jun. 30, 2022     $ 18,000     141,235,000     (134,519,000)     6,734
Balance (in shares) at Mar. 31, 2022     16,871,265                  
Balance at Mar. 31, 2022     $ 17,000     139,374,000     (132,022,000)     7,369,000
Share-based compensation     0     304,000     0     304,000
Net loss     $ 0     0     (2,497,000)     (2,497,000)
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in shares)     311,929                  
Restricted stock units issued to settle management bonus obligations $ 0     $ 271,000     $ 0     $ 271,000    
Sale of common stock, net of issuance costs (in shares)   575,000                    
Sale of common stock, net of issuance costs   $ 1,000     $ 1,286,000     $ 0     $ 1,287,000  
Share-based compensation     $ 0     304,000     0     304,000
Restricted stock units vested and issued (in shares)     311,929                  
Balance (in shares) at Jun. 30, 2022     17,758,194,000                  
Balance at Jun. 30, 2022     $ 18,000     141,235,000     (134,519,000)     6,734
Balance (in shares) at Dec. 31, 2022     20,076,773                  
Balance at Dec. 31, 2022     $ 20,000     145,476,000     (140,604,000)     4,892,000
Share-based compensation     0     278,000     0     278,000
Net loss     $ 0     0     (3,501,000)     (3,501,000)
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in shares)     18,792                  
Sale of common stock, net of issuance costs (in shares)   106,241                    
Sale of common stock, net of issuance costs   $ 0     231,000     0     231,000  
Share-based compensation     $ 0     278,000     0     278,000
Exercise of common stock options (in shares)     199                  
Exercise of common stock options           0           0
Restricted stock units vested and issued (in shares)     18,792                  
Balance (in shares) at Mar. 31, 2023     20,202,005                  
Balance at Mar. 31, 2023     $ 20,000     145,985,000     (144,105,000)     1,900,000
Balance (in shares) at Dec. 31, 2022     20,076,773                  
Balance at Dec. 31, 2022     $ 20,000     145,476,000     (140,604,000)     4,892,000
Net loss                       $ (6,925,000)
Exercise of common stock options (in shares)                       199
Balance (in shares) at Jun. 30, 2023     21,586,150                  
Balance at Jun. 30, 2023     $ 22,000     149,142,000     (147,529,000)     $ 1,635,000
Balance (in shares) at Mar. 31, 2023     20,202,005                  
Balance at Mar. 31, 2023     $ 20,000     145,985,000     (144,105,000)     1,900,000
Share-based compensation           317,000           317,000
Net loss                 (3,424,000)     (3,424,000)
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in shares)     222,405,000                  
Restricted stock units issued to settle management bonus obligations $ 0     $ 342,000     $ 0     $ 342,000    
Sale of common stock, net of issuance costs (in shares)   28,599 1,133,141                  
Sale of common stock, net of issuance costs   $ 0 $ 1,000   $ 29,000 2,469,000   $ 0 0   $ 29,000 2,470,000
Share-based compensation           317,000           317,000
Restricted stock units vested and issued (in shares)     222,405,000                  
Restricted stock units vested and issued     $ 1,000     0     0     1,000
Balance (in shares) at Jun. 30, 2023     21,586,150                  
Balance at Jun. 30, 2023     $ 22,000     $ 149,142,000     $ (147,529,000)     $ 1,635,000