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Note 6 - Number of Stock Option Awards Exercisable and their Weighted Average Exercise Price (Details)	12 Months Ended
	Dec. 31, 2015 $ / shares shares
Exercise Price Range 01 [Member]
Upper Exercise Price Range (in dollars per share) | $ / shares	$ 1,826
Outstanding Number (in shares) | shares	6,400
Outstanding Weighted Average Remaining Life	1 year 186 days
Outstanding Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 1,322
Exercisable Number (in shares) | shares	1,550
Exercise Price Range 02 [Member]
Upper Exercise Price Range (in dollars per share) | $ / shares	$ 2,792
Outstanding Number (in shares) | shares	6,100
Outstanding Weighted Average Remaining Life	4 years 229 days
Outstanding Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 2,329
Exercisable Number (in shares) | shares	4,530
Exercise Price Range 03 [Member]
Upper Exercise Price Range (in dollars per share) | $ / shares	$ 1,153
Outstanding Number (in shares) | shares	4,500
Outstanding Weighted Average Remaining Life	7 years 36 days
Outstanding Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 1,070
Exercisable Number (in shares) | shares	7,130
Exercise Price Range 04 [Member]
Upper Exercise Price Range (in dollars per share) | $ / shares	$ 3,728
Outstanding Number (in shares) | shares	8,100
Outstanding Weighted Average Remaining Life	11 years 25 days
Outstanding Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 714
Exercisable Number (in shares) | shares	11,450
Exercise Price Range 05 [Member]
Upper Exercise Price Range (in dollars per share) | $ / shares	$ 1,077
Outstanding Number (in shares) | shares	6,400
Outstanding Weighted Average Remaining Life	12 years 160 days
Outstanding Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 374
Exercisable Number (in shares) | shares	12,650
Exercise Price Range 06 [Member]
Upper Exercise Price Range (in dollars per share) | $ / shares	$ 95
Outstanding Number (in shares) | shares	9,500
Outstanding Weighted Average Remaining Life	15 years 142 days
Outstanding Weighted Average Exercise Price (in dollars per share) | $ / shares
Exercisable Number (in shares) | shares
Upper Exercise Price Range (in dollars per share) | $ / shares	$ 10,671
Outstanding Number (in shares) | shares	6,700
Outstanding Weighted Average Remaining Life	7 years 182 days
Outstanding Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 5,809
Exercisable Number (in shares) | shares	5,700

X

- Definition

The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(iii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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X

- Definition

The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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