Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 79,966	$ 100,614
Accounts receivable-net:
Trade, less current estimated credit loss of $5,835 and $7,717, respectively	92,318	80,604
Other	6,776	7,203
Inventories	2,385	2,321
Prepaid expenses and deposits	10,820	13,213
Marketable equity securities	45,789	43,203
Income taxes refundable	3,804	3,883
Total current assets	241,858	251,041
Property and equipment:
Land	36,460	23,078
Structures and improvements	44,567	43,552
Revenue equipment	675,490	689,173
Office furniture and equipment	15,439	15,328
Total property and equipment	771,956	771,131
Accumulated depreciation	(270,631)	(266,412)
Net property and equipment	501,325	504,719
Other Assets, Noncurrent	3,243	4,697
TOTAL ASSETS	746,426	760,457
Liabilities, Current [Abstract]
Accounts payable	38,703	62,652
Accrued expenses and other liabilities	16,695	16,799
Current maturities of long-term debt	52,692	57,645
Total current liabilities	108,090	137,096
Long-term debt - less current portion	218,870	204,064
Deferred income taxes	104,323	104,331
Other Liabilities, Noncurrent	500	750
Total liabilities	431,783	446,241
COMMITMENTS AND CONTINGENCIES (Note L)
STOCKHOLDERS' EQUITY
Preferred stock, $.01 par value, 10,000,000 shares authorized; none issued	0	0
Common stock, $.01 par value, 50,000,000 shares authorized; 22,331,092 and 22,317,671 shares issued; 22,034,762 and 22,021,341 shares outstanding at March 31, 2024 and December 31, 2023, respectively	223	223
Additional paid-in capital	40,971	40,825
Treasury stock, at cost; 296,330 and 296,330 shares at March 31, 2024 and December 31, 2023, respectively	(8,736)	(8,736)
Retained earnings	282,185	281,904
Total stockholders’ equity	314,643	314,216
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 746,426	$ 760,457