CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS’ EQUITY - USD ($) $ in Thousands	Common Shares	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Total
Balance at Dec. 31, 2016		$ 112,034	$ 2,040	$ (5,884)	$ (1,171)	$ 107,076
Balance (in shares) at Dec. 31, 2016	56,903,272
Balance at Dec. 31, 2016	$ 57
Adjustment to retained earnings as a result of adoption of ASU 2016-16			(533)			(533)
Stock-based compensation		1,192				1,192
Net stock options exercised		58				58
Net stock options exercised (in shares)	25,000
Common stock issued for vested restricted stock units (in shares)	78,400
Dividends declared			(1,137)			(1,137)
Common stock issued for the acquisition of mineral properties		1,300				1,300
Common stock issued for the acquisition of mineral properties (in share)	246,210
Net income (loss)			4,150			4,150
Balance at Dec. 31, 2017		114,584	4,520	(5,884)	(1,171)	112,106
Balance (in shares) at Dec. 31, 2017	57,252,882
Balance at Dec. 31, 2017	$ 57
Stock-based compensation		1,497				1,497
Net stock options exercised	$ 1	1,203				$ 1,204
Net stock options exercised (in shares)	712,271					1,412,926
Common stock issued for vested restricted stock units (in shares)	89,921
Dividends declared			(1,152)			$ (1,152)
Issuance of stock, net of issuance costs	$ 1	4,318				4,319
Issuance of stock, net of issuance costs (in shares)	1,131,755
Net income (loss)			9,288			9,288
Balance at Dec. 31, 2018		121,602	12,656	(5,884)	(1,171)	127,262
Balance (in shares) at Dec. 31, 2018	59,186,829
Balance at Dec. 31, 2018	$ 59					59
Stock-based compensation		1,932				1,932
Net stock options exercised	$ 1	97				$ 98
Net stock options exercised (in shares)	69,448					274,750
Common stock issued for vested restricted stock units (in shares)	121,060
Dividends declared			(1,612)			$ (1,612)
Issuance of stock, net of issuance costs	$ 6	24,540				24,546
Issuance of stock, net of issuance costs (in shares)	6,650,588
Net income (loss)			5,832			5,832
Balance at Dec. 31, 2019		$ 148,171	$ 16,876	$ (5,884)	$ (1,171)	158,058
Balance (in shares) at Dec. 31, 2019	66,027,925
Balance at Dec. 31, 2019	$ 66					$ 66