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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2018
Income Tax Disclosure [Abstract]  
Schedule Of Income Tax Benefit
Year Ended December 31   2018     2017  
Current taxes - Federal   $ 177,000     $ (316,000 )
Current taxes - State     48,000       6,000  
Deferred taxes - Federal     227,000       (23,000 )
Deferred taxes - State     32,000       63,000  
                 
Income tax expense (benefit)   $ 484,000     $ (270,000 )
Reconciliation Of Effective Income Tax Rate Percentage
Year Ended December 31   2018     2017  
Federal statutory rate     21.0 %     (34.0 )%
                 
Stock-based awards     0.6       7.0  
State taxes     2.8       (1.5 )
Other permanent differences     0.7       1.8  
Impact of uncertain tax positions     1.7       3.0  
Valuation allowance     (1.6 )     8.5  
Tax rate change     0.0       (14.7 )
Other     0.5       0.2  
                 
Effective federal income tax rate     25.7 %     (29.7 )%
Schedule of Resulting Noncurrent Deferred Tax Assets (Liabilities)
As of December 31   2018     2017  
Deferred tax assets            
Accrued expenses   $ 129,000     $ 183,000  
Inventory reserve     3,000       42,000  
Stock-based awards     78,000       52,000  
Reserve for bad debts     5,000       50,000  
Net operating loss and credit carryforwards     39,000       61,000  
Other     23,000       25,000  
Valuation allowance     (79,000 )     (108,000 )
                 
Total deferred tax assets   $ 198,000     $ 305,000  
                 
Deferred tax liabilities                
Depreciation   $ (635,000 )   $ (465,000 )
Prepaid expenses     (67,000 )     (85,000 )
                 
Total deferred tax liabilities     (702,000 )     (550,000 )
                 
Net deferred income tax liabilities   $ (504,000 )   $ (245,000 )
Reconciliation of the Liability for Uncertain Tax Positions
Balance at January 1, 2017   $ 554,000  
Increases due to interest     27,000  
Balance at December 31, 2017     581,000  
Increases due to interest and state tax     32,000  
Balance at December 31, 2018   $ 613,000