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Note 3 - Acquisitions - Fair Value of Net Assets Acquired (Details) - USD ($) | Mar. 31, 2020 | Dec. 31, 2019 | Nov. 12, 2019 | Nov. 11, 2019 | Aug. 08, 2019 | Aug. 07, 2019 | Apr. 01, 2019 | Mar. 31, 2019
--- | --- | --- | --- | --- | --- | --- | --- | ---
Goodwill | $ 33,506,000 | $ 33,637,000 |  |  |  |  |  |
Astero [Member] |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  | $ 11,000 |
Accounts receivable, net |  |  |  |  |  |  | 154,000 |
Inventory |  |  |  |  |  |  | 456,000 |
Intangible assets |  |  |  |  |  |  | 12,150,000 | $ 4,120,000
Goodwill |  |  |  |  |  |  | 9,515,000 | 9,500,000
Other assets |  |  |  |  |  |  | 99,000 |
Accounts payable |  |  |  |  |  |  | (250,000) |
Other liabilities |  |  |  |  |  |  | 164,000 |
Fair value of net assets acquired |  |  |  |  |  |  | 13,941,000 |
Other liabilities |  |  |  |  |  |  | (164,000) |
Fair value of net assets acquired |  |  |  |  |  |  | 13,941,000 |
Inventory |  |  |  |  |  |  | 456,000 |
Astero [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  | 160,000 | 160,000
Astero [Member] | Trade Names [Member] |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  | 470,000 | 470,000
Astero [Member] | Developed Technology Rights [Member] |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  | 2,840,000 | 2,840,000
Astero [Member] | In Process Research and Development [Member] |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  | $ 650,000 | $ 650,000
SAVSU [Member] |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  | $ 1,251,000 |  |
Accounts receivable, net |  |  |  |  |  | 753,000 |  |
Intangible assets |  |  |  |  | $ 12,200,000 |  |  |
Goodwill |  |  |  |  | 19,500,000 | 21,037,000 |  |
Accounts payable |  |  |  |  |  | (807,000) |  |
Other liabilities |  |  |  |  |  | 232,000 |  |
Fair value of net assets acquired |  |  |  |  | 35,800,000 | 35,850,000 |  |
Prepaid expenses and other current assets |  |  |  |  |  | 19,000 |  |
Property, plant and equipment, net |  |  |  |  |  | 546,000 |  |
Operating right-of-use asset |  |  |  |  | 233,000 | 233,000 |  |
Assets held for rent, net |  |  |  |  |  | 2,441,000 |  |
Deferred tax liabilities |  |  |  |  |  | (1,541,000) |  |
Other liabilities |  |  |  |  |  | (232,000) |  |
Fair value of net assets acquired |  |  |  |  | $ 35,800,000 | 35,850,000 |  |
SAVSU [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  | 80,000 |  |
SAVSU [Member] | Trade Names [Member] |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  | 1,320,000 |  |
SAVSU [Member] | Developed Technology Rights [Member] |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  | $ 10,750,000 |  |
CBS Acquisition [Member] |  |  |  |  |  |  |  |
Accounts receivable, net |  |  |  | $ 1,044,000 |  |  |  |
Inventory |  |  |  | 3,232,000 |  |  |  |
Intangible assets |  |  | $ 6,800,000 | 6,790,000 |  |  |  |
Goodwill |  |  | $ 3,100,000 | 2,954,000 |  |  |  |
Accounts payable |  |  |  | (1,197,000) |  |  |  |
Other liabilities |  |  |  | 611,000 |  |  |  |
Fair value of net assets acquired |  |  |  | 15,856,000 |  |  |  |
Prepaid expenses and other current assets |  |  |  | 29,000 |  |  |  |
Property, plant and equipment, net |  |  |  | 3,615,000 |  |  |  |
Other liabilities |  |  |  | (611,000) |  |  |  |
Fair value of net assets acquired |  |  |  | 15,856,000 |  |  |  |
Inventory |  |  |  | 3,232,000 |  |  |  |
CBS Acquisition [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |
Intangible assets |  |  |  | 560,000 |  |  |  |
CBS Acquisition [Member] | Trade Names [Member] |  |  |  |  |  |  |  |
Intangible assets |  |  |  | 800,000 |  |  |  |
CBS Acquisition [Member] | Developed Technology Rights [Member] |  |  |  |  |  |  |  |
Intangible assets |  |  |  | $ 5,430,000 |  |  |  |

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