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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
OPERATING ACTIVITIES:    
Net Income $ 2,283,000 $ 2,935,000
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 10,671,000 9,177,000
Bad debt expense 36,000 135,000
Sale leaseback deferred gain amortization (57,000)
Stock compensation-net of excess tax benefits 115,000 149,000
Provision for deferred income taxes 1,387,000 1,783,000
Reclassification of unrealized loss on marketable equity securities 235,000
Recognized (gain) loss on marketable equity securities (1,782,000) 89,000
Gain on sale or disposal of equipment (1,000) (1,390,000)
Changes in operating assets and liabilities:    
Accounts receivable (3,757,000) (5,625,000)
Prepaid expenses, inventories, and other assets 1,321,000 (255,000)
Income taxes refundable 51,000 2,386,000
Trade accounts payable 197,000 4,385,000
Accrued expenses and other liabilities 1,999,000 1,459,000
Net cash provided by operating activities 12,520,000 15,406,000
INVESTING ACTIVITIES:    
Purchases of property and equipment (4,038,000) (20,828,000)
Proceeds from disposition of equipment 4,005,000 3,970,000
Change in restricted cash (161,000) (1,239,000)
Sales of marketable equity securities 2,368,000 279,000
Purchases of marketable equity securities, net of return of capital 28,000 (886,000)
Net cash provided by (used in) investing activities 2,202,000 (18,704,000)
FINANCING ACTIVITIES:    
Borrowings under line of credit 104,149,000 117,758,000
Repayments under line of credit (105,511,000) (126,485,000)
Borrowings of long-term debt 22,054,000
Repayments of long-term debt (10,795,000) (10,377,000)
Borrowings under margin account 41,000 953,000
Repayments under margin account (2,631,000) (555,000)
Repurchases of common stock (122,000)
Proceeds from Stock Options Exercised 46,000 74,000
Net cash (used in) provided by financing activities (14,701,000) 3,300,000
NET INCREASE IN CASH AND CASH EQUIVALENTS 21,000 2,000
CASH AND CASH EQUIVALENTS-Beginning of period 137,000 157,000
CASH AND CASH EQUIVALENTS-End of period 158,000 159,000
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION-    
Interest 989,000 824,000
Income taxes 16,000 38,000
NONCASH INVESTING AND FINANCING ACTIVITIES-    
Purchases of property and equipment included in accounts payable $ 29,000 $ 10,345,000