Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 3,188	$ 37,927
Trade and other receivables, less allowance for doubtful accounts of $534 and $767	38,885	42,680
Contract assets	111,239	76,985
Inventories	43,042	29,177
Prepaid expenses and other	1,915	5,194
Total current assets	198,269	191,963
Property and equipment, less accumulated depreciation and amortization of $104,152 and $96,684	111,157	110,184
Operating lease right-of-use assets	32,769	30,813
Goodwill	22,985	22,985
Intangible assets, net	9,571	10,518
Other assets	6,216	6,552
Total assets	380,967	373,015
Current liabilities:
Current portion of long-term debt	0	7,701
Accounts payable	20,148	12,993
Accrued liabilities	17,406	16,814
Contract liabilities	5,388	6,189
Current portion of operating lease liabilities	2,401	2,204
Total current liabilities	45,343	45,901
Borrowings on line of credit	2,153	0
Long-term debt	0	5,888
Operating lease liabilities	30,004	27,911
Deferred income taxes	12,391	12,481
Other long-term liabilities	10,767	11,208
Total liabilities	100,658	103,389
Commitments and contingencies (Note 8)
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, 9,870,567 and 9,805,437 shares issued and outstanding as of September 30, 2021 and December 31, 2020, respectively	99	98
Additional paid-in-capital	124,283	123,013
Retained earnings	157,633	148,381
Accumulated other comprehensive loss	(1,706)	(1,866)
Total stockholders’ equity	280,309	269,626
Total liabilities and stockholders’ equity	$ 380,967	$ 373,015

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

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).