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Note 16 - Income Taxes - Summary of Current and Noncurrent Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Costs and estimated earnings in excess of billings on uncompleted contracts, net |  | $ 1,270
Accrued employee benefits | 2,806 | 5,025
Inventories | 296 | 563
Trade receivable, net | 105 | 199
Net operating loss carryforwards | 9,850 | 15,637
Tax credit carryforwards | 5,478 | 5,069
Other assets | 1,201 | 1,830
Other | 81 | 1,018
Deferred tax assets, gross | 19,817 | 30,611
Valuation allowance | (10,413) | (8,217)
Deferred tax assets, net | 9,404 | 22,394
Costs and estimated earnings in excess of billings on uncompleted contracts, net | (110) |
Property and equipment | (9,524) | (22,380)
Intangible assets | (433) | (819)
Prepaid expenses | (278) | (477)
Total deferred tax liabilities | (10,345) | (23,676)
Net deferred income tax liabilities | $ (941) | $ (1,282)

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- Definition Amount of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(15)(b)(2)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(15)(2)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(26)(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(26)(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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