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Schedule of Changes in Stockholders' Equity (Details) - USD ($)
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance $ 2,521,000 $ 8,176,000
Shares issued for warrant exercise   5,000
Equity-based compensation 175,000 28,000
Issuance of stock and options for services 83,000 98,000
Cash settlement of equity-based compensation (24,000)  
Net loss (910,000) (895,000)
Ending balance 1,845,000 7,412,000
Common Stock [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance
Beginning balance, shares 12,934,741 12,905,112
Shares issued for warrant exercise  
Shares issued for warrant exercise, shares   986
Equity-based compensation
Equity-based compensation, shares 35,659
Issuance of stock and options for services
Issuance of stock and options for services, shares 32,203 13,801
Cash settlement of equity-based compensation  
Net loss
Ending balance
Ending balance, shares 13,002,603 12,919,899
Additional Paid-in Capital [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance $ 60,905,000 $ 60,341,000
Shares issued for warrant exercise   5,000
Equity-based compensation 175,000 28,000
Issuance of stock and options for services 83,000 98,000
Cash settlement of equity-based compensation (24,000)  
Net loss
Ending balance 61,139,000 60,472,000
Retained Earnings [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (58,384,000) (52,165,000)
Shares issued for warrant exercise  
Equity-based compensation
Issuance of stock and options for services
Cash settlement of equity-based compensation  
Net loss (910,000) (895,000)
Ending balance $ (59,294,000) $ (53,060,000)