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Note 14 - Stockholders' Equity (Details Textual) - USD ($)			1 Months Ended		12 Months Ended
	May 09, 2016	Jan. 02, 2015	May 31, 2015	Aug. 31, 2010	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Oct. 31, 2008
Stock Repurchase Program, Authorized Amount				$ 10,000,000				$ 5,000,000
Stock Repurchase Program Additional Authorized Amount				$ 5,000,000
Treasury Stock, Shares, Acquired					0	0
Stock Repurchased and Retired During Period, Shares					18,229	96,076
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized					$ 2,200,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition					1 year 182 days
Allocated Share-based Compensation Expense					$ 1,800,000	$ 1,200,000	$ 800,000
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures					0	119,343	0
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures					$ 0	$ 500,000	$ 0
Proceeds from Issuance of Common Stock					$ 19,142,000		$ 14,046,000
Treasury Stock, Shares					0	0
D.A. Davidson and Co. [Member]
Stock Issued During Period, Shares, New Issues	5,175,000
Share Price	$ 4
Share Price, Net	$ 3.77
Proceeds from Issuance of Common Stock	$ 19,100,000
Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross			600,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period					79,240	978,526	61,957
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value					$ 4.36	$ 4.53	$ 9.05
Allocated Share-based Compensation Expense					$ 250,000	$ 250,000	$ 350,000
Restricted Stock [Member] \| Minimum [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition					3 years
Restricted Stock [Member] \| Maximum [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition					5 years
Restricted Stock [Member] \| Key Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period					20,000	917,851	18,536
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value					$ 4.78	$ 4.55	$ 11.38
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized					$ 100,000	$ 4,400,000	$ 200,000
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period					64,159	10,000	7,500
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Forfeitures and Expirations					1,875	13,750
Allocated Share-based Compensation Expense					$ 100,000
Plan 2001 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term					10 years
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized					1,900,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant					555,785
Long-term Incentive Plan [Member]
Allocated Share-based Compensation Expense						$ 1,200,000
Percentage of Incentive Plan Based on Service Completion		50.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period		3 years
Percentage of Incentive Plan Based on Shareholder Return		50.00%
Incentive Plan, Term for ShareholderReturn		3 years
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures						86,483
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited					0	54,519