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Note 11 - Stockholders' Equity (Details Textual) - USD ($)			12 Months Ended
	Dec. 09, 2016	Nov. 30, 2006	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 12, 2007
Common Stock, Par or Stated Value Per Share			$ 0.01	$ 0.01
Allocated Share-based Compensation Expense			$ 933,000	$ 776,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number			387,930	284,730
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			34,000	100,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value			$ 256,000	$ 203,000
Selling, General and Administrative Expenses [Member]
Allocated Share-based Compensation Expense			933,000	776,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value			90,000	276,000
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value			637,000	$ 421,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized			$ 990,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			1 year 211 days
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	7 years
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	10 years
The 2001 Non-qualified Stock Option Plan [Member]
Common Stock, Capital Shares Reserved for Future Issuance		300,000
Common Stock, Par or Stated Value Per Share		$ 0.01
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		4 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross			0	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number			22,930	59,730	124,480
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			36,800	64,750
The 2007 Share Incentive Plan [Member]
Common Stock, Capital Shares Reserved for Future Issuance						750,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross			140,000	125,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number			365,000	225,000	100,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			0	0
The 2007 Share Incentive Plan [Member] | Directors and Key Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross			75,324	42,320
The 2007 Share Incentive Plan [Member] | Three Key Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross			140,000
The 2016 Share Incentive Plan [Member]
Common Stock, Capital Shares Reserved for Future Issuance	750,000
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period	0

X

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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