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Note 11 - Stockholders' Equity (Details Textual) - USD ($)			12 Months Ended
	Dec. 09, 2016	Nov. 30, 2006	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 12, 2007
Common Stock, Par or Stated Value Per Share			$ 0.01	$ 0.01
Allocated Share-based Compensation Expense, Total			$ 940,000	$ 933,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance			407,930	387,930
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			0	34,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value				$ 256,000
Selling, General and Administrative Expenses [Member]
Allocated Share-based Compensation Expense, Total			$ 940,000	933,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value			116,000	90,000
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value			621,000	$ 637,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total			$ 335,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			1 year 178 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
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance			22,930	22,930	59,730
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period				36,800
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
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance			365,000	365,000	225,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period
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
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, Options, Grants in Period, Gross			20,000
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance			20,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period

X

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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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