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Consolidated Statements of Income - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Consolidated Statements of Income [Abstract]                      
Net sales $ 97,443,000 $ 94,022,000 $ 91,670,000 $ 85,835,000 $ 83,904,000 $ 83,992,000 $ 70,840,000 $ 62,975,000 $ 368,970,000 $ 301,711,000 $ 258,669,000
Cost of goods sold 73,229,000 65,123,000 69,850,000 59,844,000 62,995,000 59,564,000 52,420,000 45,159,000 268,046,000 220,138,000 177,103,000
Gross profit 24,214,000 28,899,000 21,820,000 25,991,000 20,909,000 24,428,000 18,420,000 17,816,000 100,924,000 81,573,000 81,566,000
Operating expenses:                      
General and administrative 11,284,000 8,802,000 18,219,000 11,360,000 10,031,000 12,628,000 9,812,000 5,392,000 49,665,000 37,863,000 39,684,000
Sales and marketing 2,382,000 2,671,000 2,632,000 2,280,000 1,907,000 2,281,000 1,837,000 1,826,000 9,965,000 7,851,000 7,838,000
Research and development 915,000 711,000 646,000 736,000 611,000 601,000 539,000 522,000 3,008,000 2,273,000 1,940,000
Total operating expenses 14,581,000 12,184,000 21,497,000 14,376,000 12,549,000 15,510,000 12,188,000 7,740,000 62,638,000 47,987,000 49,462,000
Operating income 9,633,000 16,715,000 323,000 11,615,000 8,360,000 8,918,000 6,232,000 10,076,000 38,286,000 33,586,000 32,104,000
Interest expense, net 2,678,000 2,516,000 2,613,000 8,437,000 3,148,000 3,165,000 3,339,000 3,413,000 16,244,000 13,065,000 18,289,000
Income from continuing operations before income tax expense 6,955,000 14,199,000 (2,290,000) 3,178,000 5,212,000 5,753,000 2,893,000 6,663,000 22,042,000 20,521,000 13,815,000
Income tax expense 4,658,000 6,451,000 (898,000) 1,268,000 2,110,000 2,826,000 1,418,000 2,714,000 11,479,000 9,068,000 7,333,000
Income from continuing operations                 10,563,000 11,453,000 6,482,000
Income from discontinued operations                 0 0 100,877,000
Net income $ 2,297,000 $ 7,748,000 $ (1,392,000) $ 1,910,000 $ 3,102,000 $ 2,927,000 $ 1,475,000 $ 3,949,000 $ 10,563,000 $ 11,453,000 $ 107,359,000
Basic net income per share from continuing operations (in dollars per share)                 $ 0.58 $ 0.68 $ 0.45
Basic net income per share from discontinued operations (in dollars per share)                 0 0 6.89
Basic net income per share (in dollars per share) $ 0.12 $ 0.42 $ (0.08) $ 0.11 $ 0.17 $ 0.16 $ 0.09 $ 0.26 0.58 0.68 7.34
Diluted net income per share from continuing operations (in dollars per share)                 0.55 0.65 0.42
Diluted net income per share from discontinued operation (in dollars per share)                 0 0 6.59
Diluted net income per share (in dollars per share) $ 0.12 $ 0.41 $ (0.08) $ 0.10 $ 0.16 $ 0.16 $ 0.09 $ 0.25 $ 0.55 $ 0.65 $ 7.01
Weighted average number of shares outstanding:                      
Basic (in shares)                 18,233,163 16,734,539 14,633,946
Diluted (in shares)                 19,066,093 17,605,940 15,317,931