Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 30,363	$ 31,014
Trade and other receivables, less allowance for doubtful accounts of $719 and $801	43,624	38,026
Contract assets	76,276	91,186
Inventories	31,945	30,654
Prepaid expenses and other	3,374	4,159
Total current assets	185,582	195,039
Property and equipment, less accumulated depreciation and amortization of $94,857 and $86,244	109,172	99,631
Operating lease right-of-use assets	31,538	7,683
Goodwill	22,985	0
Intangible assets, net	11,116	1,231
Other assets	6,432	6,661
Total assets	366,825	310,245
Current liabilities:
Current portion of long-term debt	3,132	0
Accounts payable	13,702	15,493
Accrued liabilities	14,046	12,150
Contract liabilities	4,540	12,281
Current portion of operating lease liabilities	2,303	1,642
Total current liabilities	37,723	41,566
Long-term debt	11,244	0
Operating lease liabilities	28,448	6,247
Deferred income taxes	14,611	4,265
Other long-term liabilities	11,107	10,009
Total liabilities	103,133	62,087
Commitments and contingencies (Note 10)
Stockholders’ equity:
Preferred stock, $.01 par value, 10,000,000 shares authorized, none issued or outstanding	0	0
Common stock, $.01 par value, 15,000,000 shares authorized, 9,805,437 and 9,746,979 shares issued and outstanding	98	97
Additional paid-in-capital	122,231	120,544
Retained earnings	143,160	129,331
Accumulated other comprehensive loss	(1,797)	(1,814)
Total stockholders’ equity	263,692	248,158
Total liabilities and stockholders’ equity	$ 366,825	$ 310,245

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).

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- Definition

Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).