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Stockholders' Equity (Details) - USD ($) | 3 Months Ended
--- | ---
Jul. 02, 2016 | Jun. 27, 2015
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning balance, common stock, shares |  | 8,927,989 |
Beginning balance |  | $ 353,226,000 |
Stock option exercises, amount |  | (341,000) |
Stock-based compensation |  | 370,000 |
Net income |  | 5,443,000 | $ 5,385,000
Other comprehensive loss | [1] | $ (55,000) |
Ending balance, common stock, shares |  | 8,970,314 |
Ending balance |  | $ 358,643,000 |
Pre-tax unrealized loss on available-for-sale investments |  | $ (112,000) |
Common Stock |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning balance, common stock, shares |  | 8,927,989 |
Beginning balance |  | $ 89,000 |
Stock option exercises, shares |  | 42,325 |
Stock option exercises, amount |  | $ 1,000 |
Stock-based compensation |  | 0 |
Net income |  | 0 |
Other comprehensive loss |  | $ 0 |
Ending balance, common stock, shares |  | 8,970,314 |
Ending balance |  | $ 90,000 |
Additional paid-in capital |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning balance |  | 241,662,000 |
Stock option exercises, amount |  | (342,000) |
Stock-based compensation |  | 370,000 |
Net income |  | 0 |
Other comprehensive loss |  | 0 |
Ending balance |  | 241,690,000 |
Retained earnings |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning balance |  | 110,186,000 |
Stock option exercises, amount |  | 0 |
Stock-based compensation |  | 0 |
Net income |  | 5,443,000 |
Other comprehensive loss |  | 0 |
Ending balance |  | 115,629,000 |
Accumulated other comprehensive income |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning balance |  | 1,289,000 |
Stock option exercises, amount |  | 0 |
Stock-based compensation |  | 0 |
Net income |  | 0 |
Other comprehensive loss | [1] | (55,000) |
Ending balance |  | $ 1,234,000 |
[1] | Other comprehensive income is comprised of unrealized gains and losses on available-for-sale investments. Unrealized losses before tax effect on available-for-sale securities were $112,000 for the three months ended July 2, 2016.

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- Definition Changes in additional paid in capital related to exercise of share-based payments awards (such as stock options) and the amount of recognized equity-based compensation during the period (such as nonvested shares). + References No definition available. + Details
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- Definition This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation". + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66904339&loc=d3e4534-113899 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65896087&loc=d3e11149-113907 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=65896087&loc=d3e11178-113907 + Details
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