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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
OPERATING ACTIVITIES:    
Net income $ 8,301,000 $ 1,387,000
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 13,187,000 11,623,000
Bad debt expense 69,000 158,000
Stock compensation-net of excess tax benefits 306,000 233,000
Provision for deferred income taxes 2,729,000 295,000
Recognized (gain) loss on marketable equity securities (3,184,000) 1,142,000
(Gain)/loss on disposition of equipment (425,000) 3,000
Changes in operating assets and liabilities:    
Accounts receivable (5,356,000) (6,693,000)
Prepaid expenses, deposits, inventories, and other assets 1,269,000 1,633,000
Income taxes refundable 75,000 31,000
Trade accounts payable 199,000 4,414,000
Accrued expenses and other liabilities 2,567,000 1,494,000
Net cash provided by operating activities 19,737,000 15,720,000
INVESTING ACTIVITIES:    
Purchases of property and equipment (7,926,000) (13,220,000)
Proceeds from disposition of equipment 5,787,000 756,000
Purchases of marketable equity securities, net of return of capital (72,000) (582,000)
Net cash used in investing activities (2,211,000) (13,046,000)
FINANCING ACTIVITIES:    
Borrowings under line of credit 131,387,000 130,935,000
Repayments under line of credit (133,442,000) (126,372,000)
Borrowings of long-term debt 5,789,000 6,949,000
Repayments of long-term debt (19,480,000) (14,674,000)
Borrowings under margin account 166,000 669,000
Repayments under margin account (324,000) (290,000)
Repurchases of common stock (1,618,000) (36,000)
Exercise of stock options 0 168,000
Net cash used in financing activities (17,522,000) (2,651,000)
NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH 4,000 23,000
CASH, CASH EQUIVALENTS AND RESTRICTED CASH -Beginning of period 282,000
CASH, CASH EQUIVALENTS AND RESTRICTED CASH -End of period 286,000 247,000
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION-    
Interest 2,037,000 1,164,000
Income taxes 15,000 5,000
NONCASH INVESTING AND FINANCING ACTIVITIES-    
Purchases of property and equipment included in accounts payable $ 4,025,000 $ 2,431,000