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Note 15 - Income Taxes - Summary of Current and Noncurrent Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Costs and estimated earnings in excess of billings on uncompleted contracts, net | $ 1,270 | $ 2,888
Accrued employee benefits | 5,025 | 5,946
Inventories | 563 | 2,618
Trade receivable, net | 199 | 266
Net operating loss carryforwards | 15,637 | 7,843
Tax credit carryforwards | 5,069 | 4,791
Other assets | 1,830 | 2,737
Other | 1,018 | 520
Deferred tax assets, gross | 30,611 | 27,609
Valuation allowance | (8,217) | (7,057)
Deferred tax assets, net | 22,394 | 20,552
Property and equipment | (22,380) | (24,229)
Intangible assets | (819) | (980)
Prepaid expenses | (477) | (467)
Total deferred tax liabilities | (23,676) | (25,676)
Net deferred income tax liabilities | $ (1,282) | $ (5,124)

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