Note 11 - Share-based Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended	3 Months Ended
	Feb. 06, 2019	Feb. 28, 2015	Mar. 31, 2019	Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			0	0
Share-based Payment Arrangement, Expense, Tax Benefit			$ 120	$ 58
Share-based Payment Arrangement, Option [Member]
Share-based Payment Arrangement, Expense			0	0
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total			0
Share-based Payment Arrangement, Expense, Tax Benefit			0	0
Restricted Stock Units (RSUs) [Member]
Share-based Payment Arrangement, Expense			300	400
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total			2,200
Share-based Payment Arrangement, Expense, Tax Benefit			$ 80	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	280,000		465,519
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value			$ 320	88
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition			1 year 175 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value			$ 4.23
Restricted Stock Units (RSUs) [Member] | Share-based Payment Arrangement, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	50.00%
Restricted Stock Units (RSUs) [Member] | Share-based Payment Arrangement, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	50.00%
Stock Appreciation Rights (SARs) [Member]
Share-based Payment Arrangement, Expense			$ 0	124
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total			0
Share-based Payment Arrangement, Expense, Tax Benefit			$ 0	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		2,865,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value		$ 7.33
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period		5 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term		2 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate		2.54%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate		18.77%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate		20.00%
Plan2007 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized			4,000,000