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Note 15 - Stock-based Compensation - Summary of Information About Stock-based Awards Outstanding (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Exercise Price (in dollars per share)	$ 1,548	$ 2,565
Number of shares outstanding (in shares)	4.2	4.1
Weighted average remaining contractual life in years, options outstanding (Year)	34990 years	51959 years
Aggregate intrinsic value, options outstanding	$ 432	$ 557
Number of shares exercisable (in shares)	3	2.7
Weighted average remaining contractual life in years, options exercisable (Year)	13523 years	15827 years
Exercise Price 1 [Member]
Exercise Price (in dollars per share)	$ 23	$ 15
Number of shares outstanding (in shares)	3.9	2.8
Weighted average remaining contractual life in years, options outstanding (Year)	1455 years	526 years
Aggregate intrinsic value, options outstanding		$ 15
Number of shares exercisable (in shares)		2.8
Weighted average remaining contractual life in years, options exercisable (Year)		526 years
Exercise Price 2 [Member]
Exercise Price (in dollars per share)	$ 35	$ 15
Number of shares outstanding (in shares)	1.3	2.6
Weighted average remaining contractual life in years, options outstanding (Year)	1533 years	509 years
Aggregate intrinsic value, options outstanding	$ 35	$ 15
Number of shares exercisable (in shares)	1.3	2.6
Weighted average remaining contractual life in years, options exercisable (Year)	1533 years	509 years
Exercise Price 3 [Member]
Exercise Price (in dollars per share)	$ 176	$ 108
Number of shares outstanding (in shares)	1.4	2.3
Weighted average remaining contractual life in years, options outstanding (Year)	7150 years	3608 years
Aggregate intrinsic value, options outstanding	$ 176	$ 108
Number of shares exercisable (in shares)	1.4	2.3
Weighted average remaining contractual life in years, options exercisable (Year)	7150 years	3608 years
Exercise Price 4 [Member]
Exercise Price (in dollars per share)	$ 10	$ 53
Number of shares outstanding (in shares)	0.3	2.3
Weighted average remaining contractual life in years, options outstanding (Year)	398 years	1761 years
Aggregate intrinsic value, options outstanding	$ 10	$ 28
Number of shares exercisable (in shares)	0.3	2.3
Weighted average remaining contractual life in years, options exercisable (Year)	398 years	934 years
Exercise Price 5 [Member]
Exercise Price (in dollars per share)	$ 15	$ 635
Number of shares outstanding (in shares)	5.1
Weighted average remaining contractual life in years, options outstanding (Year)	432 years
Aggregate intrinsic value, options outstanding	$ 15
Number of shares exercisable (in shares)	5.1
Weighted average remaining contractual life in years, options exercisable (Year)	432 years
Exercise Price 6 [Member]
Exercise Price (in dollars per share)	$ 15
Number of shares outstanding (in shares)	4.8	2.4
Weighted average remaining contractual life in years, options outstanding (Year)	386 years	19226 years
Aggregate intrinsic value, options outstanding	$ 15	$ 140
Number of shares exercisable (in shares)	4.8	2.4
Weighted average remaining contractual life in years, options exercisable (Year)	386 years	4247 years
Exercise Price 7 [Member]
Exercise Price (in dollars per share)	$ 1,074	$ 9
Number of shares outstanding (in shares)	4.5	2.1
Weighted average remaining contractual life in years, options outstanding (Year)	22651 years	269 years
Aggregate intrinsic value, options outstanding	$ 143	$ 1
Number of shares exercisable (in shares)	4.5	2.1
Weighted average remaining contractual life in years, options exercisable (Year)	3005 years	33 years
Exercise Price 8 [Member]
Exercise Price (in dollars per share)	$ 38	$ 68
Number of shares outstanding (in shares)	5.9	1.3
Weighted average remaining contractual life in years, options outstanding (Year)	619 years	1905 years
Aggregate intrinsic value, options outstanding	$ 38	$ 68
Number of shares exercisable (in shares)	5.9	1.3
Weighted average remaining contractual life in years, options exercisable (Year)	619 years	1905 years
Exercise Price 9 [Member]
Exercise Price (in dollars per share)	$ 30	$ 15
Number of shares outstanding (in shares)	6.6	3.8
Weighted average remaining contractual life in years, options outstanding (Year)	180 years	404 years
Aggregate intrinsic value, options outstanding		$ 15
Number of shares exercisable (in shares)		3.8
Weighted average remaining contractual life in years, options exercisable (Year)		404 years
Exercise Price 10 [Member]
Exercise Price (in dollars per share)	$ 23	$ 30
Number of shares outstanding (in shares)	4.5	4.8
Weighted average remaining contractual life in years, options outstanding (Year)	120 years	762 years
Aggregate intrinsic value, options outstanding		$ 30
Number of shares exercisable (in shares)		4.8
Weighted average remaining contractual life in years, options exercisable (Year)		762 years
Exercise Price 11 [Member]
Exercise Price (in dollars per share)	$ 109	$ 400
Number of shares outstanding (in shares)	5.9	3.6
Weighted average remaining contractual life in years, options outstanding (Year)	66 years	9640 years
Aggregate intrinsic value, options outstanding		$ 75
Number of shares exercisable (in shares)		3.6
Weighted average remaining contractual life in years, options exercisable (Year)		1807 years
Exercise Price 12 [Member]
Exercise Price (in dollars per share)		$ 17
Number of shares outstanding (in shares)		0.3
Weighted average remaining contractual life in years, options outstanding (Year)		400 years
Aggregate intrinsic value, options outstanding		$ 17
Number of shares exercisable (in shares)		0.3
Weighted average remaining contractual life in years, options exercisable (Year)		400 years
Exercise Price 13 [Member]
Exercise Price (in dollars per share)		$ 15
Number of shares outstanding (in shares)		6.1
Weighted average remaining contractual life in years, options outstanding (Year)		277 years
Aggregate intrinsic value, options outstanding
Number of shares exercisable (in shares)
Weighted average remaining contractual life in years, options exercisable (Year)
Exercise Price 14 [Member]
Exercise Price (in dollars per share)		$ 45
Number of shares outstanding (in shares)		5.8
Weighted average remaining contractual life in years, options outstanding (Year)		692 years
Aggregate intrinsic value, options outstanding		$ 45
Number of shares exercisable (in shares)		5.8
Weighted average remaining contractual life in years, options exercisable (Year)		692 years
Exercise Price 15 [Member]
Exercise Price (in dollars per share)		$ 1,080
Number of shares outstanding (in shares)		5.5
Weighted average remaining contractual life in years, options outstanding (Year)		11610 years
Aggregate intrinsic value, options outstanding
Number of shares exercisable (in shares)
Weighted average remaining contractual life in years, options exercisable (Year)
Exercise Price 16 [Member]
Exercise Price (in dollars per share)		$ 60
Number of shares outstanding (in shares)		6.9
Weighted average remaining contractual life in years, options outstanding (Year)		370 years
Aggregate intrinsic value, options outstanding
Number of shares exercisable (in shares)
Weighted average remaining contractual life in years, options exercisable (Year)

X

- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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