Note 14 - Valuation and Qualifying Accounts (Details) - Summary of the Deferred Tax Assets Valuation Allowance (Valuation Allowance of Deferred Tax Assets [Member], USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013		Dec. 31, 2012
Valuation Allowance of Deferred Tax Assets [Member]
Deferred tax assets valuation allowance
Balance at Beginning of Year	$ 22,762,000	$ 21,907,000	[1]	$ 20,551,000	[1]
Additions	3,780,000	3,437,000		1,773,000	[1]
Deductions	496,000	2,582,000		417,000	[1]
Balance at End of Year	$ 26,046,000	$ 22,762,000		$ 21,907,000	[1]

[1] The Company revised the deferred tax assets valuation allowance balance for calendar year 2012 as a result of revisions to its deferred tax assets relating to stock-based compensation and the resulting valuation allowance for them. These changes had no impact to the Company's balance sheets, statement of operations, earnings per share, statement of cash flows, or statement of equity for any period presented. The beginning balance for 2012 was reduced by $723,000, and the deductions for the year were increased by $276,000, which resulted in a net change in the ending balance for the year by $999,000.