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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities:    
Net income $ 8,723 $ 6,454
Depreciation and amortization 1,733 1,828
Deferred income taxes 142 71
Other, net 259 189
Change in assets and liabilities:    
Accounts receivable, net (3,324) (1,823)
Inventories, net (1,300) (417)
Accounts payable and accrued liabilities (898) (1,676)
Accounts with affiliates 667 (327)
Prepaids and other, net 84 32
Net cash provided by operating activities 6,086 4,331
Cash flows from investing activities:    
Capital expenditures (1,366) (1,599)
Note receivable from affiliate:    
Collections 25,900 27,200
Advances (25,300) (39,300)
Net cash used in investing activities (766) (13,699)
Cash flows from financing activities -    
Dividends paid (1,243) (1,242)
Cash and cash equivalents - net change from:    
Operating, investing and financing activities 4,077 (10,610)
Balance at beginning of period 29,655 33,153
Balance at end of period 33,732 22,543
Supplemental disclosures -    
Cash paid for income taxes $ 2,036 $ 3,747