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Note 1 - Summary of Significant Accounting Policies - Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 30, 2017 | Sep. 30, 2017 | Jul. 01, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Oct. 01, 2016 | Jul. 02, 2016 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Basic |  |  |  |  |  |  |  |  |  |
Net (loss) earnings | $ 4,377 | $ (2,958) | $ (980) | $ 320 | $ 7,789 | $ 6,821 | $ 965 | $ (13,811) | $ 15,895 | $ 56,399
Deduct preferred stock dividends |  |  |  |  |  |  |  | 23 | 23 | 23
Undistributed (loss) earnings |  |  |  |  |  |  |  | (13,834) | 15,872 | 56,376
(Loss) earnings attributable to participating preferred shareholders |  |  |  |  |  |  |  | (66) | 146 | 563
(Loss) earnings attributable to common shareholders |  |  |  |  |  |  |  | $ (13,768) | $ 15,726 | $ 55,813
Weighted average common shares outstanding (in shares) |  |  |  |  |  |  |  | 9,769 | 9,785 | 9,878
Basic (loss) earnings per common share (in dollars per share) | $ 0.45 | $ (0.30) | $ (0.10) | $ 0.03 | $ 0.78 | $ 0.69 | $ 0.09 | $ (1.41) | $ 1.61 | $ 5.65
Diluted |  |  |  |  |  |  |  |  |  |
(Loss) earnings attributable to common shareholders |  |  |  |  |  |  |  | $ (13,768) | $ 15,726 | $ 55,813
Add dividends on convertible preferred stock |  |  |  |  |  |  |  |  | 20 | 20
Earnings attributable to common stock on a diluted basis |  |  |  |  |  |  |  | $ (13,768) | $ 15,746 | $ 55,833
Weighted average common shares outstanding (in shares) |  |  |  |  |  |  |  | 9,769 | 9,785 | 9,878
Additional shares to be issued related to the equity compensation plan (in shares) |  |  |  |  |  |  |  |  | 2 | 3
Additional shares to be issued under full conversion of preferred stock (in shares) |  |  |  |  |  |  |  |  | 67 | 67
Total shares for diluted (in shares) |  |  |  |  |  |  |  | 9,769 | 9,854 | 9,948
Diluted (loss) earnings per share (in dollars per share) | $ 0.44 | $ (0.30) | $ (0.10) | $ 0.03 | $ 0.77 | $ 0.69 | $ 0.09 | $ (1.41) | $ 1.60 | $ 5.61

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