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Significant Customers and Contingencies (Details Narrative) - USD ($)
3 Months Ended 9 Months Ended 18 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Supply Commitment [Line Items]                  
Net income $ 1,363,000 $ 41,000 $ 1,310,000 $ 430,000 $ 532,000 $ (167,000) $ 2,714,000 $ 795,000  
Supply Commitment [Member]                  
Supply Commitment [Line Items]                  
Minimum assets under supply agreeement $ 1,000,000           1,000,000   $ 1,000,000
Minimum operating income for six consecutive quarters to eliminate financial covenants             $ 1,500,000    
Net income                 $ 3,900,000
Equipment sale - net book value equipment 115.00%           115.00%   115.00%
Supply Commitment [Member] | less than                  
Supply Commitment [Line Items]                  
Earnings trigger under supply agreeement             $ 0    
Cash, cash equivalents and investments trigger under supply agreeement $ 1,000,000           1,000,000   $ 1,000,000
Supply Commitment [Member] | more than                  
Supply Commitment [Line Items]                  
Cash, cash equivalents and investments trigger under supply agreeement 500,000           500,000   500,000
Accelerated debt maturity - principal amount debt 10,000,000           10,000,000   10,000,000
Non-cash requirement $ 500,000           $ 500,000   $ 500,000
Equipment sale - original book value of equipment and upgrades 30.00%           30.00%   30.00%