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Note 14 - Recent Accounting and Reporting Developments - Impact of the Adoption (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jan. 01, 2018 | Dec. 31, 2017
Trade and other receivables, less allowance for doubtful accounts of $558 and $477 | $ 33,955 |  | $ 33,955 |  | $ 28,570 | $ 28,990
Costs and estimated earnings in excess of billings on uncompleted contracts |  |  |  |  |  | 44,502
Contract assets | 64,130 |  | 64,130 |  | 42,945 | 44,502
Accrued liabilities | 6,063 |  | 6,063 |  | 5,780 | 6,563
Billings in excess of costs and estimated earnings on uncompleted contracts |  |  |  |  |  | 2,599
Contract liabilities | 802 |  | 802 |  | 2,537 | 2,599
Deferred income taxes | 67 |  | 67 |  | 684 | 941
Retained earnings | 101,046 |  | 101,046 |  | 80,882 | $ 81,757
Net sales | 52,455 | $ 38,804 | 114,605 | $ 97,153 |  |
Cost of sales | 47,252 | 36,811 | 109,292 | 93,171 |  |
Operating income (loss) | 2,497 | (1,430) | (5,672) | (7,734) |  |
Income tax benefit | (3,456) | (41) | (3,836) | (1,607) |  |
Net income | 27,801 | $ (2,069) | 20,164 | $ (8,005) |  |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |  |  |  |
Trade and other receivables, less allowance for doubtful accounts of $558 and $477 | 34,418 |  | 34,418 |  |  |
Costs and estimated earnings in excess of billings on uncompleted contracts | 66,200 |  | 66,200 |  |  |
Contract assets |  |  |  |  |  |
Accrued liabilities | 6,690 |  | 6,690 |  |  |
Billings in excess of costs and estimated earnings on uncompleted contracts | 677 |  | 677 |  |  |
Contract liabilities |  |  |  |  |  |
Deferred income taxes | 327 |  | 327 |  |  |
Retained earnings | 102,817 |  | 102,817 |  |  |
Net sales | 51,978 |  | 115,348 |  |  |
Cost of sales | 46,964 |  | 109,136 |  |  |
Operating income (loss) | 2,308 |  | (4,773) |  |  |
Income tax benefit | (3,515) |  | (3,833) |  |  |
Net income | 27,671 |  | 21,060 |  |  |
Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |
Trade and other receivables, less allowance for doubtful accounts of $558 and $477 |  |  |  |  | (420) |
Costs and estimated earnings in excess of billings on uncompleted contracts |  |  |  |  | (44,502) |
Contract assets |  |  |  |  | 42,945 |
Accrued liabilities |  |  |  |  | (783) |
Billings in excess of costs and estimated earnings on uncompleted contracts |  |  |  |  | (2,599) |
Contract liabilities |  |  |  |  | 2,537 |
Deferred income taxes |  |  |  |  | (257) |
Retained earnings |  |  |  |  | $ (875) |
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |  |  |
Trade and other receivables, less allowance for doubtful accounts of $558 and $477 | 463 |  | 463 |  |  |
Costs and estimated earnings in excess of billings on uncompleted contracts | 66,200 |  | 66,200 |  |  |
Contract assets | (64,130) |  | (64,130) |  |  |
Accrued liabilities | 627 |  | 627 |  |  |
Billings in excess of costs and estimated earnings on uncompleted contracts | 677 |  | 677 |  |  |
Contract liabilities | (802) |  | (802) |  |  |
Deferred income taxes | 260 |  | 260 |  |  |
Retained earnings | 1,771 |  | 1,771 |  |  |
Net sales | (477) |  | 743 |  |  |
Cost of sales | (288) |  | (156) |  |  |
Operating income (loss) | (189) |  | 899 |  |  |
Income tax benefit | (59) |  | 3 |  |  |
Net income | $ (130) |  | $ 896 |  |  |

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