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Income Taxes (Narrative) (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2012
Dec. 31, 2018
Proceeds from sale of common stock         $ 22,500,000  
Valuation allowance against net deferred tax asset $ 0   $ 0      
Net operating loss carry forwards 22,742,000   22,742,000      
Carryforwards utilize limit before the stock offering closed     163,000      
Unutilized operating loss carryforwards that will expire 20,520,000   20,520,000      
Reduced deferred tax assets and valuation allowance 6,977,000   6,977,000      
Additional bad debt deductions (expense)     2,250,000      
Deferred tax liability not recorded 473,000   473,000      
Deferred tax asset 1,600,000   1,600,000     $ 1,600,000
Unrecognized Tax Benefits $ 0   $ 0     $ 0
Effective tax rate 20.40% 19.80% 20.20% 19.50%    
Minimum [Member]            
Operating loss carryforwards, expiration     Dec. 31, 2024      
Maximum [Member]            
Operating loss carryforwards, expiration     Dec. 31, 2033