Income Taxes (Narrative) (Details) - USD ($)	3 Months Ended	9 Months Ended		12 Months Ended
	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Operating Loss Carryforwards [Line Items]
Tax Cuts and Jobs Act, Change in Tax Rate, Income Tax Expense (Benefit)				$ 525,000	$ 0
Deferred Tax Liability Lease Asset	$ 0			(8,938,000)	0
Deferred Tax Asset Lease Liability	$ 0			9,048,000	0
Effective Income Tax Rate Reconciliation, Deduction, Amount				$ 1,029,000	$ 945,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	2100.00%		3500.00%	21.00%	21.00%	31.55%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount				$ (2,491,000)	$ (1,663,000)	$ 1,109,000
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount					1,500,000	1,500,000
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent			2100.00%
Gross amounts of deferred tax assets	$ 90,403,000			93,401,000	90,403,000
Valuation allowance	(16,881,000)			(15,036,000)	(16,881,000)
Foreign subsidiary income				37,577,000	14,362,000	25,144,000
Undistributed Earnings of Foreign Subsidiaries				137,000,000
Income Tax Effects Allocated Directly to Equity, Employee Stock Options				169,000	1,129,000
Amount accrued for the payment of interest and penalties				46,000	38,000
Federal
Operating Loss Carryforwards [Line Items]
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount			$ 16,128,000		16,102,000
Foreign net operating losses	$ 2,372,000			$ 2,696,000	$ 2,372,000	$ 3,837,000
Scenario, Adjustment [Member] | Federal
Operating Loss Carryforwards [Line Items]
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount		$ 26,000