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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities:    
Net income $ 3,726 $ 3,151
Depreciation and amortization 878 915
Deferred income taxes 157 37
Other, net 42 14
Change in assets and liabilities:    
Accounts receivable, net (2,235) (2,644)
Inventories, net (980) (381)
Accounts payable and accrued liabilities (2,418) (2,303)
Accounts with affiliates 453 1,079
Prepaids and other, net 140 (78)
Net cash used in operating activities (237) (210)
Cash flows from investing activities:    
Capital expenditures (644) (609)
Note receivable from affiliate:    
Collections 12,600 12,500
Advances (12,400) (14,100)
Net cash used in investing activities (444) (2,209)
Cash flows from financing activities -    
Dividends paid (621) (621)
Cash and cash equivalents - net change from:    
Operating, investing and financing activities (1,302) (3,040)
Balance at beginning of period 29,655 33,153
Balance at end of period 28,353 30,113
Supplemental disclosures -    
Cash paid for income taxes $ 602 $ 585