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Note 6 - Business Segments and Sales of Products - Percentage of Sales by Segments (Details) - Revenue Benchmark [Member]	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Percentage of sales	100.00%	100.00%	100.00%	100.00%
Greens Creek [Member]
Percentage of sales	37.00%	45.00%	44.00%	48.00%
Lucky Friday [Member]
Percentage of sales	2.00%	0.00%	2.00%	2.00%
Casa Berardi [Member]
Percentage of sales	33.00%	37.00%	31.00%	39.00%
San Sebastian [Member]
Percentage of sales	10.00%	10.00%	9.00%	9.00%
Nevada Operations [Member]
Percentage of sales	18.00%	8.00%	14.00%	2.00%

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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