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Note 2 - Purchase Price Allocation (Details) - USD ($) |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 06, 2015 | Jul. 06, 2015 | Oct. 15, 2014 | Nov. 06, 2013 | Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2014 | Apr. 15, 2015 | Apr. 15, 2014
Infitrak Acquisition [Member] |  |  |  |  |  |  |  |  |
Cash consideration |  | $ 8,747,000 |  |  |  |  |  |  |
Holdback payment liability |  | 637,000 |  |  |  |  |  |  |
Contingent consideration liability |  | 9,271,000 |  |  |  |  |  |  |
Aggregate consideration |  | 18,655,000 |  |  |  |  |  |  |
Accounts receivable |  | 925,000 |  |  |  |  |  |  |
Inventories |  | 310,000 |  |  |  |  |  |  |
Property, plant and equipment |  | 530,000 |  |  |  |  |  |  |
Intangibles |  | 5,869,000 |  |  |  |  |  |  |
Goodwill |  | 13,833,000 |  |  |  |  |  |  |
Accounts payable |  | (470,000) |  |  |  |  |  |  |
Accrued liabilities |  | (767,000) |  |  |  |  |  |  |
Deferred income taxes |  | (1,575,000) |  |  |  |  |  |  |
Total purchase price allocation |  | 18,655,000 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  | $ 18,655,000 |  |  |  |  |  |  |
North Bay Acquisition [Member] |  |  |  |  |  |  |  |  |
Cash consideration | $ 10,322,000 |  |  |  |  |  |  |  |
Holdback payment liability | 1,000,000 |  |  |  |  |  |  |  |
Aggregate consideration | 11,322,000 |  |  |  |  |  |  |  |
Accounts receivable | 285,000 |  |  |  |  |  |  |  |
Inventories | 85,000 |  |  |  |  |  |  |  |
Property, plant and equipment | 229,000 |  |  |  |  |  |  |  |
Intangibles | 4,454,000 |  |  |  |  |  |  |  |
Goodwill | 7,962,000 |  |  |  |  |  |  |  |
Accrued liabilities | (100,000) |  |  |  |  |  |  |  |
Total purchase price allocation | 11,322,000 |  |  |  |  |  |  |  |
Cash | 20,000 |  |  |  |  |  |  |  |
Unearned revenues | (1,613,000) |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net | $ 11,322,000 |  |  |  |  |  |  |  |
PCD Acquisition [Member] |  |  |  |  |  |  |  |  |
Cash consideration |  |  | $ 5,000,000 |  |  |  |  |  |
Holdback payment liability |  |  | 250,000 |  |  |  |  |  |
Contingent consideration liability |  |  | 300,000 |  |  |  |  |  |
Aggregate consideration |  |  | 5,550,000 |  |  |  |  |  |
Inventories |  |  | 137,000 |  |  |  |  |  |
Property, plant and equipment |  |  | 7,000 |  |  |  |  |  |
Goodwill |  |  | 1,743,000 |  |  |  |  |  |
Total purchase price allocation |  |  | 5,550,000 |  |  |  |  |  |
Intangibles |  |  | 3,678,000 |  |  |  |  |  |
Accrued expenses |  |  | (15,000) |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  |  | $ 5,550,000 |  |  |  |  |  |
BGI [Member] |  |  |  |  |  |  |  |  |
Inventories |  |  |  |  |  |  |  | $ 1,268,000 |
Property, plant and equipment |  |  |  |  |  |  |  | 47,000 |
Goodwill |  |  |  |  |  |  |  | 3,295,000 |
Total purchase price allocation |  |  |  |  |  |  |  | 10,268,000 | $ 10,268,000
Intangibles |  |  |  |  |  |  |  | 5,711,000 |
Accrued expenses |  |  |  |  |  |  |  | (53,000) |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  |  |  |  |  |  |  | $ 10,268,000 | $ 10,268,000
Amega Scientific Corporation [Member] |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  | $ 11,268,000 |  |  |  |  |
Holdback payment liability |  |  |  | 1,000,000 |  |  |  |  |
Contingent consideration liability |  |  |  | 500,000 |  |  |  |  |
Aggregate consideration |  |  |  | 12,768,000 |  |  |  |  |
Accounts receivable |  |  |  | 663,000 |  |  |  |  |
Inventories |  |  |  | 410,000 |  |  |  |  |
Property, plant and equipment |  |  |  | 115,000 |  |  |  |  |
Goodwill |  |  |  | 6,827,000 |  |  |  |  |
Total purchase price allocation |  |  |  | 12,768,000 |  |  |  |  |
Unearned revenues |  |  |  | (1,043,000) |  |  |  |  |
Intangibles |  |  |  | 5,838,000 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  |  |  | 12,768,000 |  |  |  |  |
Prepaid expenses and other |  |  |  | 11,000 |  |  |  |  |
Accrued salaries and payroll taxes |  |  |  | (53,000) |  |  |  |  |
TempSys Inc [Member] |  |  |  |  |  |  |  |  |
Accounts receivable |  |  |  | 838,000 |  |  |  |  |
Inventories |  |  |  | 447,000 |  |  |  |  |
Property, plant and equipment |  |  |  | 25,000 |  |  |  |  |
Goodwill |  |  |  | 6,820,000 |  |  |  |  |
Accounts payable |  |  |  | (255,000) |  |  |  |  |
Deferred income taxes |  |  |  | (2,093,000) |  |  |  |  |
Total purchase price allocation |  |  |  | 9,826,000 |  |  |  |  |
Cash |  |  |  | 57,000 |  |  |  |  |
Unearned revenues |  |  |  | (485,000) |  |  |  |  |
Intangibles |  |  |  | 6,135,000 |  |  |  |  |
Accrued expenses |  |  |  | (135,000) |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  |  |  | 9,826,000 |  |  |  |  |
Prepaid expenses and other |  |  |  | 21,000 |  |  |  |  |
Accrued salaries and payroll taxes |  |  |  | (2,134,000) |  |  |  |  |
Deferred income taxes |  |  |  | $ 585,000 |  |  |  |  |
Cash consideration |  |  |  |  | $ 24,111,000 | $ 20,543,000 | $ 22,758,000 |  |
Goodwill |  |  |  |  | $ 66,137,000 | $ 44,869,000 | $ 37,866,000 |  |

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