Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 19,206	$ 31,014
Trade and other receivables, less allowance for doubtful accounts of $791 and $801	39,204	38,026
Contract assets	74,902	91,186
Inventories	35,425	30,654
Prepaid expenses and other	3,809	4,159
Total current assets	172,546	195,039
Property and equipment, less accumulated depreciation and amortization of $91,848 and $86,244	108,789	99,631
Operating lease right-of-use assets	29,645	7,683
Goodwill	22,985	0
Intangible assets, net	11,424	1,231
Other assets	6,323	6,661
Total assets	351,712	310,245
Current liabilities:
Current portion of long-term debt	3,133	0
Accounts payable	13,014	15,493
Accrued liabilities	11,876	12,150
Contract liabilities	4,731	12,281
Current portion of operating lease liabilities	2,340	1,642
Total current liabilities	35,094	41,566
Long-term debt	12,032	0
Operating lease liabilities	26,428	6,247
Deferred income taxes	12,202	4,265
Other long-term liabilities	10,448	10,009
Total liabilities	96,204	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, 9,800,810 and 9,746,979 shares issued and outstanding	98	97
Additional paid-in-capital	121,358	120,544
Retained earnings	135,893	129,331
Accumulated other comprehensive loss	(1,841)	(1,814)
Total stockholders’ equity	255,508	248,158
Total liabilities and stockholders’ equity	$ 351,712	$ 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).