CONSOLIDATED BALANCE SHEETS - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 28,729,000	$ 22,013,000
Short-term investments	10,583,000	16,583,000
Accounts receivable, net of allowance for doubtful accounts of $250 at December 31, 2018 and 2017	25,338,000	33,156,000
Current maturities of notes receivable	64,000	695,000
Prepaid expenses and other current assets	12,311,000	7,340,000
Total current assets	77,025,000	79,787,000
Property and equipment	293,948,000	307,844,000
Less accumulated depreciation	(222,407,000)	(221,271,000)
Property and equipment, net	71,541,000	86,573,000
Notes receivable, net of current maturities	1,447,000	841,000
Intangibles, net	379,000	494,000
Long-term deferred tax assets, net	293,000	224,000
Total assets	150,685,000	167,919,000
Current liabilities:
Accounts payable	5,427,000	5,933,000
Accrued liabilities:
Payroll costs and other taxes	1,034,000	1,151,000
Other	3,643,000	4,314,000
Deferred revenue	10,501,000	6,314,000
Current maturities of notes payable and obligations under capital leases	6,683,000	2,712,000
Total current liabilities	27,288,000	20,424,000
Long-term liabilities:
Notes payable and obligations under capital leases, net of current maturities	6,097,000	5,153,000
Deferred tax liabilities, net	134,000	874,000
Other accrued liabilities	150,000	150,000
Total long-term liabilities	6,381,000	6,177,000
Commitments and contingencies
Stockholders' equity:
Preferred stock-par value $1.00 per share; 4,000,000 shares authorized, none outstanding
Common stock-par value $0.01 per share; 35,000,000 shares authorized, 23,018,441 and 22,926,805 shares issued, and 22,969,996 and 22,878,360 shares outstanding at December 31, 2018 and 2017, respectively	230,000	229,000
Additional paid-in capital	153,268,000	152,022,000
Retained deficit	(34,518,000)	(10,153,000)
Treasury stock, at cost; 48,445 shares
Accumulated other comprehensive loss, net	(1,964,000)	(780,000)
Total stockholders' equity	117,016,000	141,318,000
Total liabilities and stockholders' equity	$ 150,685,000	$ 167,919,000

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

Name:	us-gaap_AccountsPayableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682