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Note 8 - Long-term Debt - Summary of Long-term Debt (Details) (Parentheticals) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Five Year Term Loan [Member] |  |
Debt instrument, face amount |  | $ 2,100,000
Debt instrument, term (Year) |  | 5 years
Monthly installments |  | $ 35,000
Interest rate |  | 3.045%
Collateral release amount per year |  | $ 200,000
Initial Collateral |  | 1,000,000
HSBC Bank Mortgage Loan [Member] |  |
Debt instrument, face amount | $ 6,000,000 | 6,000,000
Monthly installments | $ 25,000 | $ 25,000
HSBC Bank Mortgage Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |
Variable rate | 1.75% | 1.75%
HSBC Bank Mortgage Loan [Member] | Prime Rate [Member] |  |
Variable rate | 0.50% | 0.50%

X
- Definition Amount of collateral released each year for the loan. + References No definition available. + Details
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X
- Definition Amount of collateral required when the loan was secured. + References No definition available. + Details
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X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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X
- Definition Amount of the required periodic payments including both interest and principal payments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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X
- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Details
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- Details
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- Details
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