Acquisition and Purchase Price Allocation - Hotel Donauwelle (Details) $ / shares in Units, € in Thousands, $ in Thousands						3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 01, 2017 USD ($) room item	Mar. 01, 2017 USD ($) room item	Mar. 01, 2017 USD ($) room item	Mar. 01, 2017 EUR (€)	Mar. 01, 2017 USD ($) room item	Jun. 30, 2017 USD ($)	Jun. 30, 2017 EUR (€)	Jun. 30, 2017 USD ($) $ / shares shares	Jun. 30, 2017 EUR (€) shares	Dec. 31, 2016 USD ($) $ / shares shares	Mar. 01, 2017 EUR (€) room item
Business Combination, Consideration Transferred.
Cash paid | $								$ 390
Total purchase price consideration | $								4,517
Gain recognized on purchase | $								803
Hotel Donauwelle Betriebsgesellschaft
Business Acquisition
Percentage of shares acquired	100.00%	100.00%	100.00%		100.00%						100.00%
Hotel Rating, Number of Stars | item	4	4	4		4						4
Driving time from Route 55 Casino | item					35
Number of Rooms in Hotel | room	176	176	176		176						176
Number of meeting rooms		6			6
Restaurant Capacity, Number of Seats | item	120	120	120		120						120
Bar Capacity, Number of Seats | item	40	40	40		40						40
Terrace Capacity, Number of Seats | item	100	100	100		100						100
Total acquisition cost	$ 4,741	$ 4,741	$ 4,741		$ 4,741						€ 4,431
Business Combination, Consideration Transferred.
Loan term	5 years
Interest rate (as a percent)	2.95%	2.95%	2.95%		2.95%						2.95%
Remaining balance to be paid off or refinanced at end of loan term	$ 2,083	$ 2,083	$ 2,083		$ 2,083						€ 1,966
Business Acquisition, Pro Forma Information
Revenues | $								29,501		$ 57,929
Net income | $								$ 2,984		$ 7,111
Weighted Average Number of Shares Outstanding
Basic | shares								8,869,204	8,869,204	8,838,984
Diluted | shares								9,898,040	9,898,040	9,498,578
Earnings Per Share, Basic and Diluted
Basic | $ / shares								$ 0.34		$ 0.80
Diluted | $ / shares								$ 0.30		$ 0.75
Hotel Donauwelle Betriebsgesellschaft | Final Fair Value at Acquisition Date
Business Combination, Consideration Transferred.
Cash paid			390	€ 368
Due to seller (10% contingency)			31	29
Erste Bank Loan			4,096	3,866
Total purchase price consideration			4,517	4,263
Gain recognized on purchase			803	€ 758
Total	5,320	5,320	5,320		5,320						5,021
Fair value assigned to assets acquired:
Buildings	7,315	7,315	7,315		7,315						6,905
Property & equipment	693	693	693		693						654
Intangibles	5	5	5		5						5
Financial assets	1	1	1		1						1
Current assets	625	625	625		625						589
Short-term liabilities	(644)	(644)	(644)		(644)						(608)
Long-term liabilities (unfavorable lease liability)	(2,675)	(2,675)	(2,675)		(2,675)						(2,525)
Fair value estimate of assets and liabilities acquired	$ 5,320	$ 5,320	$ 5,320		$ 5,320						€ 5,021
Other Income | Hotel Donauwelle Betriebsgesellschaft
Business Combination, Consideration Transferred.
Gain recognized on purchase						$ 803	€ 758	$ 803	€ 758