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Stockholders' Equity (Narrative) (Details) - USD ($)
3 Months Ended
Feb. 08, 2021
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Stockholders' Equity          
Share-based compensation   $ 211,328 $ 129,715    
Class of Warrant or Right, Outstanding   418,441     418,441
Restricted Stock [Member]          
Stockholders' Equity          
Share-based compensation expense   $ 168,000 107,000    
Unearned share-based compensation expense in future periods   $ 347,000      
Unearned share-based compensation earn period   2 years      
Stock Option [Member]          
Stockholders' Equity          
Unearned share-based compensation expense in future periods   $ 374,000      
Unearned share-based compensation earn period   2 years      
Weighted average fair value of stock options grants (in dollars per share)   $ 1.12      
Intrinsic value of options outstanding   $ 73,000 18,000    
Intrinsic value of exercisable options   1,000 11,000    
Share-based compensation   $ 43,000 $ 22,000    
2006 and 2016 Equity Incentive Plans [Member]          
Stockholders' Equity          
Common stock reserved for future issuances (in shares)   873,180      
2016 Equity Incentive Plan [Member]          
Stockholders' Equity          
Common stock reserved for future issuances (in shares)   465,984      
Warrant [Member]          
Stockholders' Equity          
Exercise price (in dollars per share)   $ 3.25   $ 3.25  
Common Stock [Member] | Warrant [Member]          
Stockholders' Equity          
Expiration date   Jan. 17, 2023      
February 2021 Public Offering [Member] | Common Stock [Member]          
Stockholders' Equity          
Issued (in shares) 14,950,000        
Proceeds from issuance or sale of equity $ 119,100,000