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Note 11 - Operating Segments - Segment Financial Information (Details) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Revenue from external customers |  | $ 12,707,000 | $ 10,038,000
Intercompany revenues |  |  |
Gross profit |  | 2,719,000 | 34,000
Research and development |  | 389,000 | 575,000
Interest income |  | 35,000 | 16,000
Interest expense |  | (100,000) | (168,000)
Interest expense-financing fees |  | (9,000) | (57,000)
Depreciation and amortization |  | 1,155,000 | 884,000
Segment income (loss) before income taxes |  | (594,000) | (3,810,000)
Income tax expense |  | (81,000) | (36,000)
Segment income (loss) |  | (675,000) | (3,846,000)
Expenditures for segment assets |  | 22,000 | 9,000
Treatment [Member] |  |  |
Revenue from external customers |  | 10,034,000 | 7,204,000
Intercompany revenues |  | 16,000 | 4,000
Gross profit |  | 2,687,000 | (138,000)
Research and development |  | 181,000 | 106,000
Interest income |  |  |
Interest expense |  | (8,000) | (2,000)
Interest expense-financing fees |  |  |
Depreciation and amortization |  | 1,009,000 | 713,000
Segment income (loss) before income taxes |  | 1,602,000 | (1,248,000)
Income tax expense |  | (80,000) | (36,000)
Segment income (loss) |  | 1,522,000 | (1,284,000)
Expenditures for segment assets |  | 15,000 | 8,000
Services [Member] |  |  |
Revenue from external customers |  | 2,673,000 | 2,834,000
Intercompany revenues |  | 3,000 | 5,000
Gross profit |  | 32,000 | 172,000
Research and development |  |  | 26,000
Interest income |  |  |
Interest expense |  | (1,000) |
Interest expense-financing fees |  |  |
Depreciation and amortization |  | 136,000 | 161,000
Segment income (loss) before income taxes |  | (707,000) | (725,000)
Income tax expense |  |  |
Segment income (loss) |  | (707,000) | (725,000)
Expenditures for segment assets |  | 7,000 |
Medical [Member] |  |  |
Revenue from external customers |  |  |
Intercompany revenues |  |  |
Gross profit |  |  |
Research and development |  | 200,000 | 438,000
Interest income |  |  |
Interest expense |  |  |
Interest expense-financing fees |  |  |
Depreciation and amortization |  |  |
Segment income (loss) before income taxes |  | (200,000) | (438,000)
Income tax expense |  |  |
Segment income (loss) |  | (200,000) | (438,000)
Expenditures for segment assets |  |  | 1,000
Segments Total [Member] |  |  |
Revenue from external customers |  | 12,707,000 | 10,038,000
Intercompany revenues |  | 19,000 | 9,000
Gross profit |  | 2,719,000 | 34,000
Research and development |  | 381,000 | 570,000
Interest income |  |  |
Interest expense |  | (9,000) | (2,000)
Interest expense-financing fees |  |  |
Depreciation and amortization |  | 1,145,000 | 874,000
Segment income (loss) before income taxes |  | 695,000 | (2,411,000)
Income tax expense |  | (80,000) | (36,000)
Segment income (loss) |  | 615,000 | (2,447,000)
Expenditures for segment assets |  | 22,000 | 9,000
Corporate and Other [Member] |  |  |
Revenue from external customers | [1] |  |
Intercompany revenues | [1] |  |
Gross profit | [1] |  |
Research and development | [1] | 8,000 | 5,000
Interest income | [1] | 35,000 | 16,000
Interest expense | [1] | (91,000) | (166,000)
Interest expense-financing fees | [1] | (9,000) | (57,000)
Depreciation and amortization | [1] | 10,000 | 10,000
Segment income (loss) before income taxes | [1] | (1,289,000) | (1,399,000)
Income tax expense | [1] | (1,000) |
Segment income (loss) | [1] | (1,290,000) | (1,399,000)
Expenditures for segment assets | [1] |  |
[1] | Amounts reflect the activity for corporate headquarters not included in the segment information.

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