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Note 3 - PF Medical (Details Textual) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Jul. 24, 2015 | Aug. 31, 2014
Private Placement [Member] | Series E Common Stock [Member] | PF Medical SA [Member] |  |  |  |
Common Stock, Value, Subscriptions |  |  |  | $ 2,357,000
Common Stock, Shares Unpaid |  |  |  | 250,000
Digirad Agreements [Member] | Restricted Series F Stock [Member] | PF Medical SA [Member] |  |  |  |
Share Purchase Agreement, Number of Shares |  |  | 71,429 |
Share Purchase Agreement, Aggregate Purchase Price |  |  | $ 1,000,000 |
Share Purchase Agreement, Shares Issued Percentage of Outstanding Shares |  |  | 5.40% |
Series E Common Stock [Member] | PF Medical SA [Member] |  |  |  |
Common Stock, Shares Unpaid | 86,585 |  |  |
Payments of Stock Issuance Costs | $ 242,000 |  |  |
Stock Issued During Period, Shares, New Issues | 250,000 |  |  |
PF Medical SA [Member] |  |  |  |
Cash Received from Capital Transaction | $ 67,000 | $ 1,478,000 |  |
Amount Held in Escrow Account [Member] |  |  |  |
Restricted Cash and Cash Equivalents | 67,000 |  |  |
Professional Fees | $ 29,000 | $ 242,000 |  |
Share Purchase Agreement, Company Ownership Percentage Prior to Share Issuance |  |  | 64.00% |
Share Purchase Agreement, Company Ownership Percentage Post Share Issuance |  |  | 60.50% |

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