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Note 10 - Preferred Stock (Details Textual) |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 02, 2005 USD ($) $ / shares shares | Mar. 28, 2005 USD ($) $ / shares shares | Mar. 25, 2004 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($)
Preferred Stock Dividends, Income Statement Impact | $ |  |  |  | $ 139,000 | $ 139,000
Dividends Payable, Current | $ |  |  |  | 303,000 | 160,000
Other Current Liabilities [Member] |  |  |  |  |
Dividends Payable, Current | $ |  |  |  | $ 303,000 | $ 160,000
Series A Preferred Stock [Member] |  |  |  |  |
Stock Issued During Period, Value, New Issues | $ |  |  | $ 5,000,000 |  |
Preferred Stock, Dividend Rate, Percentage |  |  | 5.00% |  |
Stock Issued During Period, Shares, New Issues |  |  | 1,000,000 |  |
Share Price | $ / shares |  |  | $ 5 |  |
Proceeds from Issuance of Preferred Stock and Preference Stock | $ |  |  | $ 5,000,000 |  |
Preferred Stock Issuance Costs | $ |  |  | $ 275,000 |  |
Convertible Preferred Stock, Shares Issued upon Conversion |  |  | 1,590,331 | 318,065 |
Preferred Stock, Conversion Price Per Share | $ / shares |  |  | $ 3.144 |  |
Preferred Stock, Voting Rights Number |  |  | 1.5903 |  |
Preferred Stock, Liquidation Preference Per Share | $ / shares |  |  | $ 5 |  |
Preferred Stock, Redemption Price Per Share | $ / shares |  |  | $ 5 |  |
Preferred Stock, Shares Outstanding |  |  |  | 200,000 |
Preferred Stock Dividends, Income Statement Impact | $ |  |  |  | $ 50,000 |
Series A Preferred Stock [Member] | Chief Executive Officer [Member] |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  | 140,000 |  |
Series A Preferred Stock [Member] | Director [Member] |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  | 60,000 |  |
Series B Preferred Stock [Member] |  |  |  |  |
Stock Issued During Period, Value, New Issues | $ |  | $ 2,700,000 |  |  |
Preferred Stock, Dividend Rate, Percentage |  | 5.00% |  |  |
Stock Issued During Period, Shares, New Issues |  | 1,065,200 |  |  |
Share Price | $ / shares |  | $ 2.50 |  |  |
Proceeds from Issuance of Preferred Stock and Preference Stock | $ |  | $ 2,700,000 |  |  |
Preferred Stock Issuance Costs | $ |  | $ 173,000 |  |  |
Convertible Preferred Stock, Shares Issued upon Conversion |  | 1,065,200 |  | 460,000 |
Preferred Stock, Conversion Price Per Share | $ / shares |  | $ 2.50 |  |  |
Preferred Stock, Liquidation Preference Per Share | $ / shares |  | 2.50 |  |  |
Preferred Stock, Shares Outstanding |  |  |  | 460,000 |
Preferred Stock Dividends, Income Statement Impact | $ |  |  |  | $ 58,000 |
Series B Preferred Stock [Member] | Minimum [Member] |  |  |  |  |
Preferred Stock, Redemption Price Per Share | $ / shares |  | $ 3.25 |  |  |
Series B Preferred Stock [Member] | Chief Executive Officer [Member] |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 260,000 |  |  |
Series B Preferred Stock [Member] | Director [Member] |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 60,000 |  |  |
Series B Preferred Stock [Member] | Chief Financial Officer [Member] |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 100,000 |  |  |
Series C Preferred Stock [Member] |  |  |  |  |
Stock Issued During Period, Value, New Issues | $ | $ 1,200,000 |  |  |  |
Preferred Stock, Dividend Rate, Percentage | 5.00% |  |  |  |
Stock Issued During Period, Shares, New Issues | 564,607 |  |  |  |
Share Price | $ / shares | $ 2.18 |  |  |  |
Proceeds from Issuance of Preferred Stock and Preference Stock | $ | $ 1,200,000 |  |  |  |
Preferred Stock Issuance Costs | $ | $ 100,000 |  |  |  |
Convertible Preferred Stock, Shares Issued upon Conversion | 564,607 |  |  | 289,377 |
Preferred Stock, Conversion Price Per Share | $ / shares | $ 2.18 |  |  |  |
Preferred Stock, Liquidation Preference Per Share | $ / shares | 2.18 |  |  |  |
Preferred Stock, Shares Outstanding |  |  |  | 289,377 |
Preferred Stock Dividends, Income Statement Impact | $ |  |  |  | $ 31,000 |
Series C Preferred Stock [Member] | Minimum [Member] |  |  |  |  |
Preferred Stock, Redemption Price Per Share | $ / shares | $ 2.834 |  |  |  |
Series C Preferred Stock [Member] | Chief Executive Officer [Member] |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 123,853 |  |  |  |
Series C Preferred Stock [Member] | Director [Member] |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 27,523 |  |  |  |
Series C Preferred Stock [Member] | Chief Financial Officer [Member] |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 68,808 |  |  |  |

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- Definition Represents the number of votes per share that holders of preferred stock will receive based on the conversion rate of the preferred stock. + References No definition available. + Details
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- Definition Number of shares issued for each share of convertible preferred stock that is converted. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(27)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 + Details
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- Definition Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6935-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Current Liabilities -URI http://asc.fasb.org/extlink&oid=6509677 + Details
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- Definition The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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