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Income Taxes (Narrative) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2012
Dec. 31, 2018
Proceeds from sale of common stock     $ 22,500,000  
Valuation allowance against net deferred tax asset $ 0      
Net operating loss carry forwards 22,742,000      
Carryforwards utilize limit before the stock offering closed 163,000      
Unutilized operating loss carryforwards that will expire 20,520,000      
Reduced deferred tax assets and valuation allowance 6,977,000      
Additional bad debt deductions (expense) 2,250,000      
Deferred tax liability not recorded 473,000      
Deferred tax asset 1,600,000     $ 1,600,000
Unrecognized Tax Benefits $ 0     $ 0
Effective tax rate 20.00% 19.10%    
Minimum [Member]        
Operating loss carryforwards, expiration Dec. 31, 2024      
Maximum [Member]        
Operating loss carryforwards, expiration Dec. 31, 2033