Note 12 - Employee Benefit and Retirement Plans - Status of Defined Benefit Plans (Details) - USD ($)		12 Months Ended
	Dec. 31, 2016	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017	Jan. 01, 2017
Plan curtailment	$ (4,200,000)
Amounts not yet reflected in net periodic benefit costs and included in accumulated other comprehensive loss
Plan curtailment	$ (4,200,000)
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	3.77%							4.31%
US and UK Plans Combined [Member]
Benefit obligation at beginning of year		$ 159,213,000	$ 169,696,000	$ 175,233,000
Service cost				1,405,000
Interest cost		6,013,000	6,077,000	6,246,000
Plan curtailment				(4,170,000)
Exchange rate changes		(1,697,000)	707,000	(909,000)
Benefits paid		(7,217,000)	(6,489,000)	(6,902,000)
Actuarial (gain) loss		13,368,000	(10,778,000)	(1,207,000)
Benefit obligation at end of year		169,680,000	159,213,000	169,696,000
Actual return on plan assets		6,589,000	2,545,000	5,302,000
Employer contributions		5,413,000	4,366,000	5,000,000
Benefits paid		(7,217,000)	(6,489,000)	(6,902,000)
Exchange rate changes		(1,445,000)	493,000	(637,000)
Funded status at end of year					$ (47,647,000)	$ (40,520,000)	$ (51,918,000)
Amounts recognized in balance sheet
Current liability					(324,000)	(67,000)	(63,000)
Noncurrent liability					(47,323,000)	(40,453,000)	(51,855,000)
Net amount recognized in balance sheet					(47,647,000)	(40,520,000)	(51,918,000)
Amounts not yet reflected in net periodic benefit costs and included in accumulated other comprehensive loss
Prior service cost
Accumulated loss					(15,590,000)	(4,038,000)	(12,131,000)
Amounts not yet recognized as a component of net periodic benefit cost					(15,590,000)	(4,038,000)	(12,131,000)
Accumulated net periodic benefit cost in excess of contributions					(32,057,000)	(36,482,000)	(39,787,000)
Net amount recognized in balance sheet					(47,647,000)	(40,520,000)	(51,918,000)
Service cost				1,405,000
Interest cost		6,013,000	6,077,000	6,246,000
Expected return on plan assets		(5,129,000)	(5,140,000)	(5,173,000)
Recognized actuarial loss		284,000	26,000	107,000
Net periodic benefit cost		1,168,000	963,000	2,585,000
Prior service cost
Net loss					(38,000)	(28,000)	(26,000)
Projected benefit obligation					169,680,000	159,213,000	169,696,000
Accumulated benefit obligation					169,680,000	159,213,000	169,696,000
Fair value of assets					122,033,000	118,693,000	117,778,000
Benefit obligation at beginning of year		159,213,000	169,696,000	175,233,000
Plan curtailment				(4,170,000)
Benefits paid		(7,217,000)	(6,489,000)	(6,902,000)
Actuarial (gain) loss		13,368,000	(10,778,000)	(1,207,000)
Benefit obligation at end of year		169,680,000	159,213,000	169,696,000
Actual return on plan assets		6,589,000	2,545,000	5,302,000
Employer contributions		5,413,000	4,366,000	5,000,000
Benefits paid		(7,217,000)	(6,489,000)	(6,902,000)
Funded status at end of year					(47,647,000)	(40,520,000)	(51,918,000)
Current liability					(324,000)	(67,000)	(63,000)
Noncurrent liability					(47,323,000)	(40,453,000)	(51,855,000)
Exchange rate changes		(1,697,000)	707,000	(909,000)
Benefits paid		(7,217,000)	(6,489,000)	(6,902,000)
Exchange rate changes		(1,445,000)	493,000	(637,000)
US and UK Plans Combined [Member] | Change in Plan Assets [Member]
Fair value of plan assets at beginning of year		118,693,000	117,778,000	115,015,000
Fair value of plan assets at end of year		122,033,000	118,693,000	117,778,000
Amounts not yet reflected in net periodic benefit costs and included in accumulated other comprehensive loss
Fair value of plan assets at beginning of year		118,693,000	117,778,000	115,015,000
Fair value of plan assets at end of year		118,693,000	118,693,000	117,778,000	122,033,000	118,693,000	117,778,000
Fair value of plan assets at end of year		122,033,000	118,693,000	117,778,000
US Domestic Plan [Member]
Benefit obligation at beginning of year		116,277,000	124,138,000	130,863,000
Service cost				1,405,000
Interest cost		4,854,000	4,804,000	4,994,000
Plan curtailment				(4,170,000)
Benefits paid		(5,565,000)	(4,786,000)	(5,106,000)
Actuarial (gain) loss		10,814,000	(7,879,000)	(3,848,000)
Benefit obligation at end of year		126,380,000	116,277,000	124,138,000
Actual return on plan assets		4,132,000	1,645,000	1,079,000
Employer contributions		4,443,000	3,353,000	4,045,000
Benefits paid		(5,565,000)	(4,786,000)	(5,106,000)
Funded status at end of year					(41,230,000)	(34,137,000)	(42,210,000)
Amounts recognized in balance sheet
Current liability					(324,000)	(67,000)	(63,000)
Noncurrent liability					(40,906,000)	(34,070,000)	(42,147,000)
Net amount recognized in balance sheet					(41,230,000)	(34,137,000)	(42,210,000)
Amounts not yet reflected in net periodic benefit costs and included in accumulated other comprehensive loss
Prior service cost
Accumulated loss					(13,196,000)	(2,731,000)	(8,254,000)
Amounts not yet recognized as a component of net periodic benefit cost					(13,196,000)	(2,731,000)	(8,254,000)
Accumulated net periodic benefit cost in excess of contributions					(28,034,000)	(31,406,000)	(33,956,000)
Net amount recognized in balance sheet					(41,230,000)	(34,137,000)	(42,210,000)
Service cost				1,405,000
Interest cost		4,854,000	4,804,000	4,994,000
Expected return on plan assets		(4,067,000)	(4,026,000)	(4,046,000)
Recognized actuarial loss		284,000	26,000	107,000
Net periodic benefit cost		1,071,000	804,000	2,460,000
Prior service cost
Net loss					(38,000)	(28,000)	(26,000)
Projected benefit obligation					126,380,000	116,277,000	124,138,000
Fair value of assets					$ 85,150,000	$ 82,140,000	$ 81,928,000
Benefit obligation at beginning of year		116,277,000	124,138,000	130,863,000
Plan curtailment				(4,170,000)
Benefits paid		(5,565,000)	(4,786,000)	(5,106,000)
Actuarial (gain) loss		10,814,000	(7,879,000)	(3,848,000)
Benefit obligation at end of year		126,380,000	116,277,000	124,138,000
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate					3.56%	4.27%	3.92%
Actual return on plan assets		4,132,000	1,645,000	1,079,000
Employer contributions		4,443,000	3,353,000	4,045,000
Benefits paid		$ (5,565,000)	$ (4,786,000)	$ (5,106,000)
Funded status at end of year					$ (41,230,000)	$ (34,137,000)	$ (42,210,000)
Current liability					(324,000)	(67,000)	(63,000)
Noncurrent liability					(40,906,000)	(34,070,000)	(42,147,000)
Discount rate		4.27%	3.92%	3.77%
Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Expected Long Term Return on Assets		5.00%	5.00%	5.00%
Accumulated benefit obligation					126,380,000	116,277,000	124,138,000
Benefits paid		$ (5,565,000)	$ (4,786,000)	$ (5,106,000)
US Domestic Plan [Member] | Change in Plan Assets [Member]
Fair value of plan assets at beginning of year		82,140,000	81,928,000	81,910,000
Fair value of plan assets at end of year		85,150,000	82,140,000	81,928,000
Amounts not yet reflected in net periodic benefit costs and included in accumulated other comprehensive loss
Fair value of plan assets at beginning of year		82,140,000	81,928,000	81,910,000
Fair value of plan assets at end of year		82,140,000	82,140,000	81,928,000	85,150,000	82,140,000	81,928,000
Fair value of plan assets at end of year		85,150,000	82,140,000	81,928,000
UK Plan [Member]
Benefit obligation at beginning of year		42,936,000	45,558,000	44,370,000
Service cost
Interest cost		1,159,000	1,273,000	1,252,000
Exchange rate changes		(1,697,000)	707,000	(909,000)
Benefits paid		(1,652,000)	(1,703,000)	(1,796,000)
Actuarial (gain) loss		2,554,000	(2,899,000)	2,641,000
Benefit obligation at end of year		43,300,000	42,936,000	45,558,000
Actual return on plan assets		2,457,000	900,000	4,223,000
Employer contributions		970,000	1,013,000	954,000
Benefits paid		(1,652,000)	(1,703,000)	(1,796,000)
Exchange rate changes		(1,445,000)	493,000	(636,000)
Funded status at end of year					(6,417,000)	(6,383,000)	(9,708,000)
Amounts recognized in balance sheet
Noncurrent liability					(6,417,000)	(6,383,000)	(9,708,000)
Net amount recognized in balance sheet					(6,417,000)	(6,383,000)	(9,708,000)
Amounts not yet reflected in net periodic benefit costs and included in accumulated other comprehensive loss
Accumulated loss					(2,394,000)	(1,307,000)	(3,877,000)
Amounts not yet recognized as a component of net periodic benefit cost					(2,394,000)	(1,307,000)	(3,877,000)
Net amount recognized in balance sheet					(6,417,000)	(6,383,000)	(9,708,000)
Service cost
Interest cost		1,159,000	1,273,000	1,252,000
Expected return on plan assets		(1,062,000)	(1,114,000)	(1,127,000)
Net periodic benefit cost		97,000	159,000	125,000
Projected benefit obligation					43,300,000	42,936,000	45,558,000
Fair value of assets					$ 36,883,000	$ 36,553,000	$ 35,850,000
Benefit obligation at beginning of year		42,936,000	45,558,000	44,370,000
Benefits paid		(1,652,000)	(1,703,000)	(1,796,000)
Actuarial (gain) loss		2,554,000	(2,899,000)	2,641,000
Benefit obligation at end of year		43,300,000	42,936,000	45,558,000
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate					2.39%	2.70%	2.73%
Actual return on plan assets		2,457,000	900,000	4,223,000
Employer contributions		970,000	1,013,000	954,000
Benefits paid		$ (1,652,000)	$ (1,703,000)	$ (1,796,000)
Funded status at end of year					$ (6,417,000)	$ (6,383,000)	$ (9,708,000)
Noncurrent liability					(6,417,000)	(6,383,000)	(9,708,000)
Discount rate		2.80%	2.73%	3.00%
Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Expected Long Term Return on Assets		2.98%	3.01%	3.59%
Accumulated benefit obligation					43,300,000	42,936,000	45,558,000
Exchange rate changes		$ (1,697,000)	$ 707,000	$ (909,000)
Benefits paid		(1,652,000)	(1,703,000)	(1,796,000)
Exchange rate changes		(1,445,000)	493,000	(636,000)
Prior service cost
Accumulated net periodic benefit cost in excess of contributions					(4,023,000)	(5,076,000)	(5,831,000)
Amortization of net loss
UK Plan [Member] | Change in Plan Assets [Member]
Fair value of plan assets at beginning of year		36,553,000	35,850,000
Fair value of plan assets at end of year		36,883,000	36,553,000	35,850,000
Amounts not yet reflected in net periodic benefit costs and included in accumulated other comprehensive loss
Fair value of plan assets at beginning of year		36,553,000	35,850,000
Fair value of plan assets at end of year		36,883,000	36,553,000	35,850,000	$ 36,883,000	36,553,000	35,850,000
Fair value of plan assets at end of year		36,883,000	36,553,000	35,850,000
UK Plan [Member] | Debt Security, Corporate, US [Member]
Fair value of plan assets at beginning of year		36,553,000	35,850,000	33,105,000
Fair value of plan assets at end of year			36,553,000	35,850,000
Amounts not yet reflected in net periodic benefit costs and included in accumulated other comprehensive loss
Fair value of plan assets at beginning of year		36,553,000	35,850,000	33,105,000
Fair value of plan assets at end of year		$ 36,553,000	36,553,000	35,850,000		$ 36,553,000	$ 35,850,000
Fair value of plan assets at end of year			$ 36,553,000	$ 35,850,000