Note 18 - Earnings (Loss) Per Share - Basic and Diluted Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended																12 Months Ended
	Dec. 31, 2018		Sep. 30, 2018		Jun. 30, 2018		Mar. 31, 2018		Dec. 31, 2017		Sep. 30, 2017		Jun. 30, 2017		Mar. 31, 2017		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net income (loss)	$ 2,440	[1]	$ 2,437		$ 1,983		$ 1,934		$ 33,270	[1]	$ 1,794		$ 1,709		$ 1,680		$ 8,794	$ 38,453	$ (2,753)
Earnings (losses) allocated to unvested shares																	144	967	(88)
Net income (loss) attributable to common shareholders, basic and diluted																	$ 8,650	$ 37,486	$ (2,665)
Weighted average common shares including unvested common shares and participating preferred shares outstanding (in shares)																	7,159,723	6,249,059	5,980,945
Weighted average shares outstanding (in shares)																	7,042,693	6,091,932	5,788,713
Basic income (loss) per common share (in dollars per share)	$ 0.33	[2]	$ 0.33	[2]	$ 0.27	[2]	$ 0.31	[2]	$ 5.31	[2]	$ 0.29	[2]	$ 0.27	[2]	$ 0.27	[2]	$ 1.23	$ 6.15	$ (0.46)
Add: Dilutive effects of assumed exercises of common stock warrants (in shares)
Weighted average common shares and potential common shares (in shares)																	7,042,693	6,091,932	5,788,713
Diluted income (loss) per common share (in dollars per share)	$ 0.33	[2]	$ 0.33	[2]	$ 0.27	[2]	$ 0.31	[2]	$ 5.31	[2]	$ 0.29	[2]	$ 0.27	[2]	$ 0.27	[2]	$ 1.23	$ 6.15	$ (0.46)
Unvested Shares [Member]
Weighted average shares outstanding (in shares)																	117,030	157,127	192,232

[1] Net income for the fourth quarter of 2017 was impacted by the reversal of the Company's deferred tax asset valuation allowance and the change in federal corporate tax rates in connection with the enactment of the Tax Cuts and Jobs Act of 2017. The net result of these two items, as well as tax expense for the year, was an income tax benefit of $31.9 million.

[2] The sum of the quarterly net income (loss) per share (basic and diluted) differs from the annual net income (loss) per share (basic and diluted) because of the differences in the weighted average number of common shares outstanding and the common shares used in the quarterly and annual computations as well as differences in rounding.