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Note 11 - Stockholders' Equity and Earnings Per Share (Details Textual) - USD ($)			3 Months Ended		6 Months Ended		12 Months Ended
	May 31, 2018	Feb. 09, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2014	Dec. 31, 2017
Treasury Stock, Shares, Acquired					44,068
Payments for Repurchase of Common Stock						$ 338,000
Common Stock, Shares, Outstanding, Ending Balance			16,726,610		16,726,610			16,253,426
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance			1,051,648		1,051,648
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares					952,994
Class of Warrant or Right, Outstanding			2,600,000		2,600,000
Allocated Share-based Compensation Expense, Total			$ 100,000	$ 200,000	$ 200,000	$ 600,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			0	0	0	0
Proceeds from Stock Options Exercised			$ 0	$ 0	$ 0	$ 0
Class of Warrant or Right, Exercised During Period			0	0	0	0
Proceeds from Warrant Exercises			$ 0	$ 0	$ 0	$ 0
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period					7,905
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance			310,487		310,487
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options			$ 300,000		$ 300,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition					1 year 182 days
Common Stock [Member]
Treasury Stock, Shares, Acquired
Stock Issued During Period, Shares, Restricted Stock Award, Gross					473,120
Stock Incentive Plan 2010 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized			2,700,000		2,700,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized after IPO			3,300,000		3,300,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross					30,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price					$ 1.81
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period					3 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value					$ 0.73
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period					33,849
The 2014 Non-Employee Director Compensation Plan [Member] \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period					44,132
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value					$ 1.81
JPMorgan Chase Funding Inc. [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights		600,000	600,000		600,000
Class of Warrant or Right, Period		2 years
Class of Warrant or Right, Exercise Price of Warrants or Rights		$ 2.25
Common Class C [Member]
Payments for Repurchase of Common Stock					$ 0
Common Class D [Member]
Common Stock, Shares, Outstanding, Ending Balance			0		0			0
Series B-1 and B-2 Cumulative Convertible Preferred Stock [Member]
Preferred Stock, Shares Issued, Total							8,200,000
Increase in Carrying Amount of Redeemable Preferred Stock							$ 26,400,000
Series B-3 Cumulative Convertible Preferred Stock [Member]
Preferred Stock, Par or Stated Value Per Share		$ 0.01
Preferred Stock, Dividend Rate, Percentage		5.65%
Preferred Stock, Liquidation Preference, Percent		145.00%
Series B-3 Cumulative Convertible Preferred Stock [Member] \| JPMorgan Chase Funding Inc. [Member]
Preferred Stock, Shares Issued, Total		2,352,941	2,352,941		2,352,941
Preferred Stock, Par or Stated Value Per Share		$ 0.01
Sale of Stock, Price Per Share		$ 3.40
Preferred Stock, Value, Subscriptions		$ 8,000,000
Series B-1 Cumulative Convertible Preferred Stock [Member]
Preferred Stock, Par or Stated Value Per Share		$ 0.01
Series B-2 Cumulative Convertible Preferred Stock [Member]
Preferred Stock, Par or Stated Value Per Share		0.01
Series B Preferred Stock [Member] \| JPMorgan Chase Funding Inc. [Member]
Sale of Stock, Price Per Share		$ 3.40
Preferred Stock, Value, Subscriptions		$ 8,000,000
Series A Preferred Stock [Member]
Temporary Equity, Stock Issued During Period, Value, New Issues	$ 22,000				$ 22,000
Temporary Equity, Share Issued, Price Per Share	1,000
Proceeds from Issuance of Redeemable Preferred Stock	$ 22,000,000
Temporary Equity, Dividend Rate, Percentage	7.50%