Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 9,656	$ 31,014
Trade and other receivables, less allowance for doubtful accounts of $778 and $801	38,789	38,026
Contract assets	79,350	91,186
Inventories	39,259	30,654
Prepaid expenses and other	4,375	4,159
Total current assets	171,429	195,039
Property and equipment, less accumulated depreciation and amortization of $88,786 and $86,244	108,315	99,631
Operating lease right-of-use assets	28,678	7,683
Goodwill	22,985
Intangible assets, net	11,997	1,231
Other assets	5,909	6,661
Total assets	349,313	310,245
Current liabilities:
Current portion of long-term debt	2,911
Accounts payable	17,933	15,493
Accrued liabilities	10,670	12,150
Contract liabilities	7,882	12,281
Current portion of operating lease liabilities	2,450	1,642
Total current liabilities	41,846	41,566
Long-term debt, less current portion	12,968
Operating lease liabilities, less current portion	25,264	6,247
Deferred income taxes	10,293	4,265
Other long-term liabilities	9,757	10,009
Total liabilities	100,128	62,087
Commitments and contingencies (Note 10)
Stockholders’ equity:
Preferred stock, $.01 par value, 10,000,000 shares authorized, none issued or outstanding
Common stock, $.01 par value, 15,000,000 shares authorized, 9,787,995 and 9,746,979 shares issued and outstanding	98	97
Additional paid-in-capital	120,902	120,544
Retained earnings	129,895	129,331
Accumulated other comprehensive loss	(1,710)	(1,814)
Total stockholders’ equity	249,185	248,158
Total liabilities and stockholders’ equity	$ 349,313	$ 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).